Influenza
Conditions
Keywords
H1N1, influenza A viruses, pregnant women
Brief summary
The purpose of this study is to evaluate an investigational 2009 H1N1 influenza vaccine to determine vaccine safety in pregnant women and the body's immune response (body's defense against disease) to different strengths of the H1N1 influenza vaccine. In this study, 2 strengths of the H1N1 influenza vaccine will be tested (given 3 weeks apart). Participants will include approximately 120 healthy pregnant women, ages 18-39 years, in their second or third trimester of pregnancy (14-34 weeks gestation). Study procedures will include 2 doses of vaccine, blood samples, cord blood samples at delivery, and recording temperature and vaccine side effects in a memory aid for 8 days following each vaccination. Participants will be involved in study related procedures for about 7 months.
Detailed description
Recently, a novel swine-origin influenza A/H1N1 virus was identified as a significant cause of febrile respiratory illnesses in Mexico and the United States. It rapidly spread to many countries around the world, prompting the World Health Organization to declare a pandemic on June 11, 2009. Data from several cohorts in different age groups that received licensed trivalent seasonal influenza vaccines suggest that these vaccines are unlikely to provide protection against the new virus. In addition, adults are more likely to have measurable levels of serum hemagglutination inhibition assay (HAI) or neutralizing antibody than are children. These data indicate the need to develop vaccines against the new H1N1 strain and suggest that different vaccine strategies (e.g., number of doses, need for adjuvant) may be appropriate for persons in different age groups. Pregnant women are at an increased risk for the complications of influenza. A higher dose or multiple doses of an unadjuvanted, inactivated influenza H1N1 vaccine may be necessary to confer protection to this at risk population. This protocol will explore the antibody response following vaccination of pregnant women at 2 different dose levels (15 mcg and 30 mcg). The 2 doses of inactivated influenza H1N1 vaccine will be administered 21 days apart. This study will assess the immune response following a single dose of H1N1 vaccine, to assess whether individuals have any pre-existing prime immunity, such that the initial H1N1 vaccination serves as a boost, thus conferring a more rapid time to protection with the need for fewer doses. Antibody responses will be assessed 21 days after each dose. The primary objectives are: safety, to assess the safety of unadjuvanted, inactivated H1N1influenza vaccine in pregnant women when administered at the 15 mcg or 30 mcg dose; and immunogenicity, to assess the antibody response following a single dose of unadjuvanted, inactivated H1N1 influenza vaccine in pregnant women when administered at the 15 mcg or 30 mcg dose. The secondary objectives are to: assess the antibody response following 2 doses of unadjuvanted, inactivated H1N1 influenza vaccine in pregnant women when administered at the 15 mcg or 30 mcg dose; and assess the efficiency of placental transport of maternal influenza antigen specific antibodies to the neonate. This is a randomized, double-blinded, phase II study in 120 pregnant women, ages 18-39 years. Subjects will be randomized into 2 groups (60 pregnant women per dose group) to receive intramuscular inactivated influenza H1N1 vaccine at 15 mcg (Group 1) or 30 mcg (Group 2) on Days 0 and 21. Following immunization, safety will be measured by assessment of adverse events through 21 days following the last vaccination (Day 42), serious adverse events and new-onset chronic medical conditions through 7 months post first vaccination (Day 201). Reactogenicity to the vaccine will be assessed for 8 days following each vaccination (Day 0-7). Immunogenicity testing will include HAI and neutralizing antibody testing on serum obtained on Days 0, 21 and 42. This includes samples collected prior to each vaccination and samples collected 21 days following each vaccination. HAI antibody testing will be also be performed on serum from maternal and cord blood collected at delivery.
Interventions
BIOLOGICALInactivated H1N1 Vaccine
Two doses of inactivated influenza H1N1 vaccine delivered intramuscularly (IM) as 15 or 30 mcg dose. The 15 mcg dose will be administered as a single 0.5 mL IM injection in the deltoid muscle of the preferred arm. The 30 mcg dose will be administered as a single 1.0 mL injection in the deltoid muscle.
Sponsors
National Institute of Allergy and Infectious Diseases (NIAID)
Study design
Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
PREVENTION
Masking
TRIPLE (Subject, Investigator, Outcomes Assessor)
Eligibility
Sex/Gender
FEMALE
Age
18 Years to 39 Years
Healthy volunteers
Yes
Inclusion criteria
* Pregnant female between the ages of 18 and 39 years, inclusive. * Is from 14-34 weeks of gestation, inclusive. * Had at least one prenatal visit during which pregnancy was confirmed. * Is in good health, as determined by vital signs (heart rate 100 beats per minute; blood pressure: systolic 140 mm Hg; diastolic less than or equal to 90 mm Hg; oral temperature less than 100 degrees Fahrenheit), medical history to ensure any existing medical diagnoses or conditions are stable and not considered clinically significant, and targeted physical examination based on medical history. A stable medical condition is defined as health outcomes of the specific disease are considered to be within acceptable limits in the last 3 months. * Able to understand and comply with planned study procedures. * Provides written informed consent prior to initiation of any study procedures. * Agrees to sign medical release for herself and her infant(s) to allow study staff to gather pregnancy outcome data, if needed per clinical site policy.
Exclusion criteria
* Has a known allergy to eggs or other components in the vaccines (these may include, but are not limited to: gelatin, formaldehyde, octoxinol and chicken protein). * Has a history of severe reactions following previous immunization with influenza virus vaccines. * Has participated in a novel influenza H1N1 2009 vaccine study in the past 2 years or has history of novel influenza H1N1 2009 infection prior to enrollment. * Has received any other live licensed vaccines within 4 weeks or inactivated licensed vaccines within 2 weeks prior to vaccination in this study prior to vaccination or plan receipt of such vaccines within 21 days following the last vaccination (except for seasonal inactivated influenza vaccine which may be received 2 weeks post either vaccination). Measles, mumps, and rubella vaccine and tetanus, diphtheria, and acellular pertussis vaccine are permitted post-partum. * Has received an experimental/investigational agent (vaccine, drug, biologic, device, blood product, or medication) within one month prior to vaccination in this study, or expects to receive another experimental/investigational agent during the study period (prior to the Day 201 follow-up call - 180 days after the second vaccination). * Has an acute illness and/or an oral temperature greater than or equal to 100.0 degrees Fahrenheit, within 72 hours of vaccination (This may result in a temporary delay of vaccination). * Has immunosuppression as a result of an underlying illness or treatment, or use of anti-cancer chemotherapy or radiation therapy within the preceding 36 months. * Has an active neoplastic disease (excluding non-melanoma skin cancer), a history of any hematologic malignancy, current bleeding disorder, or taking anticoagulants. * Long term use of glucocorticoids, including oral or parenteral, or high-dose inhaled steroids (\>800 micrograms/day of beclomethasone dipropionate or equivalent) within the preceding 6 months (nasal and topical steroids are allowed) or has received betamethasone or dexamethasone to accelerate fetal lung maturity. * Has a history of receiving immunoglobulin or other blood product (with exception of Rhogam) within the 3 months prior to enrollment in this study. * Has a diagnosis of a current and uncontrolled major psychiatric disorder. * Has been hospitalized for psychiatric illness, history of suicide attempt, or confinement for danger to self or others, within the past 10 years. * The subject is receiving any of the following psychiatric drugs: aripiprazole, clozapine, ziprasidone, haloperidol, molindone, loxapine, thioridazine, thiothixene, pimozide, fluphenazine, risperidone, mesoridazine, quetiapine, trifluoperazine, trifluopromazine, chlorprothixene, chlorpromazine, perphenazine, olanzapine, carbamazepine, divalproex sodium, lithium carbonate or lithium citrate. Subjects who are receiving an antidepressant drug (not listed above) and are stable for at least 3 months prior to enrollment without decompensating are allowed enrollment into the study. * Known active human immunodeficiency virus (HIV), hepatitis B, or hepatitis C infection. * History of alcohol or drug abuse in the last 5 years. * Has a seizure disorder or is on an anti-seizure medication. * Has a history of Guillain-Barré Syndrome. * Plan to travel outside of North America in the time between the first vaccination and 42 days following the first vaccination. * Has an acute or chronic medical condition that, in the opinion of the investigator would render vaccination unsafe, or would interfere with the evaluation of responses (this includes, but is not limited to, known cardiac disease, chronic liver disease, significant renal disease, unstable or progressive neurological disorder, transplant recipients or uncontrolled diabetes, juvenile diabetes (Type I) or advanced diabetes with renal disease or eye disease, diabetes controlled by diet or insulin is acceptable.) * Has any condition that would, in the opinion of the site investigator, place the subject at an unacceptable risk of injury or render the subject unable to meet the requirements of the protocol.
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Number of Participants Reporting Vaccine-associated Serious Adverse Events (SAEs) | Day 0 through Day 180 after last vaccination | Serious adverse events included any untoward medical occurrence that resulted in death of the mother, fetus or infant; was life threatening to mother, fetus or infant; was a persistent/significant disability/incapacity; required in-patient hospitalization or prolongation thereof; was a congenital anomaly/birth defect in fetus or infant; or may have jeopardized the mother, fetus or infant, or required intervention to prevent one of the outcomes, or was described as Guillain-Barré Syndrome. Association was determined by a clinician licensed to diagnose and listed on the site's FDA Form 1572. |
| Number of Participants With 4-fold or Greater Serum Hemagglutination Inhibition (HAI) Antibody Titer Increases Against Influenza H1N1 2009 Virus Following a Single Dose of H1N1 Vaccine | Day 0 prior to and Day 21 after the first vaccination | Blood was collected from all participants prior to the initial vaccination as well as 21 days after the first vaccination for testing in the HAI assay with Influenza H1N1 2009 virus as the assay antigen. A participant met the threshold of a 4-fold rise in titer if the Day 0 titer was less than 1:10 (the assay's lowest level of detection) and the Day 21 post vaccination titer was 1:40 or greater, or the Day 0 titer was greater than or equal to 1:10 and the Day 21 post vaccination titer was an increase by 4-fold or more. |
| Number of Participants With a Serum Hemagglutination Inhibition (HAI) Antibody Titer of 1:40 or Greater Against Influenza H1N1 2009 Virus Following a Single Dose of H1N1 Vaccine | Day 21 after the first vaccination | Blood was collected from all participants at Day 21 post first vaccination for testing in the HAI assay with Influenza H1N1 2009 virus as the assay antigen. Each sample was tested at least twice according to standard operating procedures and the result of each replicate reported. A participant is counted if the geometric mean of the replicate values was 1:40 or greater. |
| Number of Participants Reporting Maternal Complications of Pregnancy, Labor and Delivery | At time of delivery | Participants were contacted after delivery, and medical records reviewed, to collect complications experienced during pregnancy, labor and delivery. The data collection process followed a prospectively-defined list of complications reported for this outcome measure, some of which may have also been reported as serious adverse events if otherwise meeting those requirements. |
| Number of Participants Reporting Neonatal Complications | At time of delivery | Participants were contacted after delivery, and medical records reviewed, to collect neonatal complications. The data collection process followed a prospectively-defined list of complications reported for this outcome measure, some of which may have also been reported as serious adverse events if otherwise meeting those requirements. |
| Number of Participants Reporting Solicited Subjective Local Reactions After First Vaccination | Within 8 days (Day 0-7) post first vaccination | Participants maintained a memory aid to record daily the occurrence of local reactions of pain, tenderness and swelling for 8 days after vaccination (Day 0-7) based on their interference with daily activities. Participants are counted if they were reported as experiencing the symptom at any severity on any of the 8 days. |
| Number of Participants Reporting Solicited Subjective Local Reactions After Second Vaccination | Within 8 days (Day 0-7) post second vaccination | Participants maintained a memory aid to record daily the occurrence of local reactions of pain, tenderness and swelling for 8 days after vaccination (Day 0-7) based on their interference with daily activities. Participants are counted if they were reported as experiencing the symptom at any severity on any of the 8 days. |
| Number of Participants Reporting Solicited Quantitative Local Reactions After First Vaccination | Within 8 days (Day 0-7) post first vaccination | Participants maintained a memory aid to record daily the occurrence of local reactions of redness and swelling for 8 days after vaccination (Day 0-7). If the reaction was present, the maximum diameter was measured in millimeters (mm). Participants are counted if they reported experiencing the reaction with any measurement greater than 0 mm on any of the 8 days. |
| Number of Participants Reporting Solicited Quantitative Local Reactions After Second Vaccination | Within 8 days (Day 0-7) post second vaccination | Participants maintained a memory aid to record daily the occurrence of local reactions of redness and swelling for 8 days after vaccination (Day 0-7). If the reaction was present, the maximum diameter was measured in millimeters (mm). Participants are counted if they reported experiencing the reaction with any measurement greater than 0 mm on any of the 8 days. |
| Number of Participants Reporting Solicited Subjective Systemic Reactions After First Vaccination | Within 8 days (Day 0-7) post first vaccination | Participants maintained a memory aid to record daily the occurrence of systemic symptoms of feverishness, malaise, myalgia, headache, and nausea for 8 days after vaccination (Day 0-7) based on their interference with daily activities. Participants are counted if they reported experiencing the symptom at any severity on any of the 8 days. |
| Number of Participants Reporting Solicited Subjective Systemic Reactions After Second Vaccination | Within 8 days (Day 0-7) post second vaccination | Participants maintained a memory aid to record daily the occurrence of systemic symptoms of feverishness, malaise, myalgia, headache, and nausea for 8 days after vaccination (Day 0-7) based on their interference with daily activities. Participants are counted if they reported experiencing the symptom at any severity on any of the 8 days. |
| Number of Participants Reporting Fever After First Vaccination | Within 8 days (Day 0-7) post first vaccination | Participants were provided with a thermometer and a memory aid on which to record daily oral temperatures for 8 days after vaccination (Day 0-7). The protocol defined fever as oral temperature of 37.8 degrees Celsius or higher. Participants are counted as experiencing fever if they reported oral temperatures of 37.8 degrees Celsius or higher on any of the 8 days. |
| Number of Participants Reporting Fever After Second Vaccination | Within 8 days (Day 0-7) post second vaccination | Participants were provided with a thermometer and a memory aid on which to record daily oral temperatures for 8 days after vaccination (Day 0-7). The protocol defined fever as oral temperature of 37.8 degrees Celsius or higher. Participants are counted as experiencing fever if they reported oral temperatures of 37.8 degrees Celsius or higher on any of the 8 days. |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Number of Participants With a Serum Hemagglutination Inhibition Assay (HAI) Antibody Titer Greater Than or Equal to 40 Against the Novel Influenza H1N1 2009 Virus in Cord Blood | At time of delivery | Cord blood was collected at the time of delivery for testing in the HAI assay with Influenza H1N1 2009 virus as the assay antigen. Each sample was tested at least twice according to standard operating procedures and the result of each replicate reported. A participant is counted if the geometric mean of the replicate values was 1:40 or greater. |
| Number of Participants With 4-fold or Greater Serum Hemagglutination Inhibition (HAI) Antibody Titer Increases Against Influenza H1N1 2009 Virus Following 2 Doses of H1N1 Vaccine | Day 0 prior to first vaccination and Day 21 after the second vaccination | Blood was collected from all participants prior to the initial vaccination as well as 21 days after the second vaccination for testing in the HAI assay with Influenza H1N1 2009 virus as the assay antigen. A participant met the threshold of a 4-fold rise in titer if the Day 0 titer was less than 1:10 (the assay's lowest level of detection) and the Day 21 post vaccination 2 titer was 1:40 or greater, or the Day 0 titer was greater than or equal to 1:10 and the Day 21 post vaccination 2 titer was an increase by 4-fold or more. |
| Number of Participants With a Serum Hemagglutination Inhibition (HAI) Antibody Titer of 1:40 or Greater Against Influenza H1N1 2009 Virus Following 2 Doses of H1N1 Vaccine | Day 21 after the second vaccination | Blood was collected from all participants at Day 21 post second vaccination for testing in the HAI assay with Influenza H1N1 2009 virus as the assay antigen. Each sample was tested at least twice according to standard operating procedures and the result of each replicate reported. A participant is counted if the geometric mean of the replicate values was 1:40 or greater. |
| Number of Participants With a Serum Hemagglutination Inhibition Assay (HAI) Antibody Titer Greater Than or Equal to 40 Against the Novel Influenza H1N1 2009 Virus in the Maternal Blood at the Time of Delivery | At time of delivery | Blood was collected from participants at the time of delivery for testing in the HAI assay with Influenza H1N1 2009 virus as the assay antigen. Each sample was tested at least twice according to standard operating procedures and the result of each replicate reported. A participant is counted if the geometric mean of the replicate values was 1:40 or greater. |
Countries
United States
Participant flow
Recruitment details
Participants were healthy pregnant women recruited from existing volunteer populations and from the communities at large around the clinical sites. Participants were enrolled between 09Sep2009 and 16Oct2009.
Participants by arm
| Arm | Count |
|---|---|
| 15 Mcg H1N1 Vaccine Participants received 15 mcg of Inactivated H1N1 Vaccine by intramuscular injection on Day 0 and Day 21. | 60 |
| 30 Mcg H1N1 Vaccine Participants received 30 mcg of Inactivated H1N1 Vaccine by intramuscular injection on Day 0 and Day 21. | 60 |
| Total | 120 |
Baseline characteristics
| Characteristic | 30 Mcg H1N1 Vaccine | 15 Mcg H1N1 Vaccine | Total |
|---|---|---|---|
| Age, Categorical <=18 years | 0 Participants | 0 Participants | 0 Participants |
| Age, Categorical >=65 years | 0 Participants | 0 Participants | 0 Participants |
| Age, Categorical Between 18 and 65 years | 60 Participants | 60 Participants | 120 Participants |
| Age Continuous | 31.2 years STANDARD_DEVIATION 4.3 | 31.7 years STANDARD_DEVIATION 4.3 | 31.4 years STANDARD_DEVIATION 4.3 |
| Region of Enrollment United States | 60 participants | 60 participants | 120 participants |
| Sex: Female, Male Female | 60 Participants | 60 Participants | 120 Participants |
| Sex: Female, Male Male | 0 Participants | 0 Participants | 0 Participants |
Adverse events
| Event type | EG000 affected / at risk | EG001 affected / at risk |
|---|---|---|
| deaths Total, all-cause mortality | — / — | — / — |
| other Total, other adverse events | 53 / 60 | 54 / 60 |
| serious Total, serious adverse events | 9 / 60 | 6 / 60 |
Outcome results
Primary
Number of Participants Reporting Fever After First Vaccination
Participants were provided with a thermometer and a memory aid on which to record daily oral temperatures for 8 days after vaccination (Day 0-7). The protocol defined fever as oral temperature of 37.8 degrees Celsius or higher. Participants are counted as experiencing fever if they reported oral temperatures of 37.8 degrees Celsius or higher on any of the 8 days.
Time frame: Within 8 days (Day 0-7) post first vaccination
Population: All participants receiving the first vaccination are included in the safety cohort. Analyses are as treated.
| Arm | Measure | Value (NUMBER) |
|---|---|---|
| 15 Mcg H1N1 Vaccine | Number of Participants Reporting Fever After First Vaccination | 0 Participants |
| 30 Mcg H1N1 Vaccine | Number of Participants Reporting Fever After First Vaccination | 1 Participants |
Primary
Number of Participants Reporting Fever After Second Vaccination
Participants were provided with a thermometer and a memory aid on which to record daily oral temperatures for 8 days after vaccination (Day 0-7). The protocol defined fever as oral temperature of 37.8 degrees Celsius or higher. Participants are counted as experiencing fever if they reported oral temperatures of 37.8 degrees Celsius or higher on any of the 8 days.
Time frame: Within 8 days (Day 0-7) post second vaccination
Population: All participants receiving the second vaccination are included in the safety cohort. Analyses are as treated.
| Arm | Measure | Value (NUMBER) |
|---|---|---|
| 15 Mcg H1N1 Vaccine | Number of Participants Reporting Fever After Second Vaccination | 1 Participants |
| 30 Mcg H1N1 Vaccine | Number of Participants Reporting Fever After Second Vaccination | 0 Participants |
Primary
Number of Participants Reporting Maternal Complications of Pregnancy, Labor and Delivery
Participants were contacted after delivery, and medical records reviewed, to collect complications experienced during pregnancy, labor and delivery. The data collection process followed a prospectively-defined list of complications reported for this outcome measure, some of which may have also been reported as serious adverse events if otherwise meeting those requirements.
Time frame: At time of delivery
Population: All participants from whom outcome data were collected are included in the ITT safety population for this outcome measure.
| Arm | Measure | Group | Value (NUMBER) |
|---|---|---|---|
| 15 Mcg H1N1 Vaccine | Number of Participants Reporting Maternal Complications of Pregnancy, Labor and Delivery | Fever | 2 Participants |
| 15 Mcg H1N1 Vaccine | Number of Participants Reporting Maternal Complications of Pregnancy, Labor and Delivery | Pre-eclampsia | 1 Participants |
| 15 Mcg H1N1 Vaccine | Number of Participants Reporting Maternal Complications of Pregnancy, Labor and Delivery | Anaphylaxis | 0 Participants |
| 15 Mcg H1N1 Vaccine | Number of Participants Reporting Maternal Complications of Pregnancy, Labor and Delivery | Gestational diabetes | 1 Participants |
| 15 Mcg H1N1 Vaccine | Number of Participants Reporting Maternal Complications of Pregnancy, Labor and Delivery | Antibiotics prior to delivery | 26 Participants |
| 15 Mcg H1N1 Vaccine | Number of Participants Reporting Maternal Complications of Pregnancy, Labor and Delivery | Eclampsia | 0 Participants |
| 15 Mcg H1N1 Vaccine | Number of Participants Reporting Maternal Complications of Pregnancy, Labor and Delivery | Fetal abnormalities detected during pregnancy | 3 Participants |
| 15 Mcg H1N1 Vaccine | Number of Participants Reporting Maternal Complications of Pregnancy, Labor and Delivery | Oligohydramnios | 2 Participants |
| 15 Mcg H1N1 Vaccine | Number of Participants Reporting Maternal Complications of Pregnancy, Labor and Delivery | Assisted vaginal delivery | 4 Participants |
| 15 Mcg H1N1 Vaccine | Number of Participants Reporting Maternal Complications of Pregnancy, Labor and Delivery | Fetal Distress | 1 Participants |
| 15 Mcg H1N1 Vaccine | Number of Participants Reporting Maternal Complications of Pregnancy, Labor and Delivery | Non-elective Cesarean section | 4 Participants |
| 15 Mcg H1N1 Vaccine | Number of Participants Reporting Maternal Complications of Pregnancy, Labor and Delivery | Miscarriage | 1 Participants |
| 15 Mcg H1N1 Vaccine | Number of Participants Reporting Maternal Complications of Pregnancy, Labor and Delivery | Abnormal amniotic fluid | 11 Participants |
| 15 Mcg H1N1 Vaccine | Number of Participants Reporting Maternal Complications of Pregnancy, Labor and Delivery | Abruptio Placenta | 1 Participants |
| 15 Mcg H1N1 Vaccine | Number of Participants Reporting Maternal Complications of Pregnancy, Labor and Delivery | Postpartum fever | 1 Participants |
| 15 Mcg H1N1 Vaccine | Number of Participants Reporting Maternal Complications of Pregnancy, Labor and Delivery | Pregnancy induced hypertension | 0 Participants |
| 15 Mcg H1N1 Vaccine | Number of Participants Reporting Maternal Complications of Pregnancy, Labor and Delivery | Postpartum endometritis | 0 Participants |
| 15 Mcg H1N1 Vaccine | Number of Participants Reporting Maternal Complications of Pregnancy, Labor and Delivery | Chorioamnionitis | 3 Participants |
| 15 Mcg H1N1 Vaccine | Number of Participants Reporting Maternal Complications of Pregnancy, Labor and Delivery | Postpartum bleeding | 5 Participants |
| 15 Mcg H1N1 Vaccine | Number of Participants Reporting Maternal Complications of Pregnancy, Labor and Delivery | Polyhydramnios | 1 Participants |
| 15 Mcg H1N1 Vaccine | Number of Participants Reporting Maternal Complications of Pregnancy, Labor and Delivery | Postpartum bacteremia | 0 Participants |
| 15 Mcg H1N1 Vaccine | Number of Participants Reporting Maternal Complications of Pregnancy, Labor and Delivery | Stillborn | 1 Participants |
| 30 Mcg H1N1 Vaccine | Number of Participants Reporting Maternal Complications of Pregnancy, Labor and Delivery | Postpartum bacteremia | 0 Participants |
| 30 Mcg H1N1 Vaccine | Number of Participants Reporting Maternal Complications of Pregnancy, Labor and Delivery | Stillborn | 0 Participants |
| 30 Mcg H1N1 Vaccine | Number of Participants Reporting Maternal Complications of Pregnancy, Labor and Delivery | Miscarriage | 0 Participants |
| 30 Mcg H1N1 Vaccine | Number of Participants Reporting Maternal Complications of Pregnancy, Labor and Delivery | Gestational diabetes | 4 Participants |
| 30 Mcg H1N1 Vaccine | Number of Participants Reporting Maternal Complications of Pregnancy, Labor and Delivery | Polyhydramnios | 0 Participants |
| 30 Mcg H1N1 Vaccine | Number of Participants Reporting Maternal Complications of Pregnancy, Labor and Delivery | Oligohydramnios | 2 Participants |
| 30 Mcg H1N1 Vaccine | Number of Participants Reporting Maternal Complications of Pregnancy, Labor and Delivery | Pregnancy induced hypertension | 3 Participants |
| 30 Mcg H1N1 Vaccine | Number of Participants Reporting Maternal Complications of Pregnancy, Labor and Delivery | Pre-eclampsia | 2 Participants |
| 30 Mcg H1N1 Vaccine | Number of Participants Reporting Maternal Complications of Pregnancy, Labor and Delivery | Eclampsia | 0 Participants |
| 30 Mcg H1N1 Vaccine | Number of Participants Reporting Maternal Complications of Pregnancy, Labor and Delivery | Fetal Distress | 3 Participants |
| 30 Mcg H1N1 Vaccine | Number of Participants Reporting Maternal Complications of Pregnancy, Labor and Delivery | Abruptio Placenta | 0 Participants |
| 30 Mcg H1N1 Vaccine | Number of Participants Reporting Maternal Complications of Pregnancy, Labor and Delivery | Chorioamnionitis | 2 Participants |
| 30 Mcg H1N1 Vaccine | Number of Participants Reporting Maternal Complications of Pregnancy, Labor and Delivery | Fever | 2 Participants |
| 30 Mcg H1N1 Vaccine | Number of Participants Reporting Maternal Complications of Pregnancy, Labor and Delivery | Anaphylaxis | 0 Participants |
| 30 Mcg H1N1 Vaccine | Number of Participants Reporting Maternal Complications of Pregnancy, Labor and Delivery | Antibiotics prior to delivery | 20 Participants |
| 30 Mcg H1N1 Vaccine | Number of Participants Reporting Maternal Complications of Pregnancy, Labor and Delivery | Fetal abnormalities detected during pregnancy | 5 Participants |
| 30 Mcg H1N1 Vaccine | Number of Participants Reporting Maternal Complications of Pregnancy, Labor and Delivery | Assisted vaginal delivery | 3 Participants |
| 30 Mcg H1N1 Vaccine | Number of Participants Reporting Maternal Complications of Pregnancy, Labor and Delivery | Non-elective Cesarean section | 4 Participants |
| 30 Mcg H1N1 Vaccine | Number of Participants Reporting Maternal Complications of Pregnancy, Labor and Delivery | Abnormal amniotic fluid | 12 Participants |
| 30 Mcg H1N1 Vaccine | Number of Participants Reporting Maternal Complications of Pregnancy, Labor and Delivery | Postpartum fever | 0 Participants |
| 30 Mcg H1N1 Vaccine | Number of Participants Reporting Maternal Complications of Pregnancy, Labor and Delivery | Postpartum endometritis | 0 Participants |
| 30 Mcg H1N1 Vaccine | Number of Participants Reporting Maternal Complications of Pregnancy, Labor and Delivery | Postpartum bleeding | 5 Participants |
Primary
Number of Participants Reporting Neonatal Complications
Participants were contacted after delivery, and medical records reviewed, to collect neonatal complications. The data collection process followed a prospectively-defined list of complications reported for this outcome measure, some of which may have also been reported as serious adverse events if otherwise meeting those requirements.
Time frame: At time of delivery
Population: All live births are included in this outcome measure, which excludes 2 participants whose pregnancies ended in miscarriage or stillbirth. Three participants gave birth to twins and one to triplets, each counted separately.
| Arm | Measure | Group | Value (NUMBER) |
|---|---|---|---|
| 15 Mcg H1N1 Vaccine | Number of Participants Reporting Neonatal Complications | Sepsis | 0 Participants |
| 15 Mcg H1N1 Vaccine | Number of Participants Reporting Neonatal Complications | Congenital abnormalities | 1 Participants |
| 15 Mcg H1N1 Vaccine | Number of Participants Reporting Neonatal Complications | Meningitis | 0 Participants |
| 15 Mcg H1N1 Vaccine | Number of Participants Reporting Neonatal Complications | Small for gestational age | 3 Participants |
| 15 Mcg H1N1 Vaccine | Number of Participants Reporting Neonatal Complications | Metabolic complications | 4 Participants |
| 15 Mcg H1N1 Vaccine | Number of Participants Reporting Neonatal Complications | Pre-term (less than 37 weeks) | 10 Participants |
| 15 Mcg H1N1 Vaccine | Number of Participants Reporting Neonatal Complications | Respiratory complications | 6 Participants |
| 15 Mcg H1N1 Vaccine | Number of Participants Reporting Neonatal Complications | Abnormal infant exam | 15 Participants |
| 15 Mcg H1N1 Vaccine | Number of Participants Reporting Neonatal Complications | Respiratory support used | 5 Participants |
| 15 Mcg H1N1 Vaccine | Number of Participants Reporting Neonatal Complications | Hematological complications | 3 Participants |
| 15 Mcg H1N1 Vaccine | Number of Participants Reporting Neonatal Complications | Fever 100.4 degrees Fahrenheit or greater | 0 Participants |
| 15 Mcg H1N1 Vaccine | Number of Participants Reporting Neonatal Complications | Infection | 0 Participants |
| 15 Mcg H1N1 Vaccine | Number of Participants Reporting Neonatal Complications | Admission to special nursery/infant intensive care | 6 Participants |
| 15 Mcg H1N1 Vaccine | Number of Participants Reporting Neonatal Complications | Large for gestational age | 12 Participants |
| 30 Mcg H1N1 Vaccine | Number of Participants Reporting Neonatal Complications | Admission to special nursery/infant intensive care | 6 Participants |
| 30 Mcg H1N1 Vaccine | Number of Participants Reporting Neonatal Complications | Hematological complications | 1 Participants |
| 30 Mcg H1N1 Vaccine | Number of Participants Reporting Neonatal Complications | Pre-term (less than 37 weeks) | 7 Participants |
| 30 Mcg H1N1 Vaccine | Number of Participants Reporting Neonatal Complications | Large for gestational age | 3 Participants |
| 30 Mcg H1N1 Vaccine | Number of Participants Reporting Neonatal Complications | Small for gestational age | 1 Participants |
| 30 Mcg H1N1 Vaccine | Number of Participants Reporting Neonatal Complications | Abnormal infant exam | 13 Participants |
| 30 Mcg H1N1 Vaccine | Number of Participants Reporting Neonatal Complications | Infection | 0 Participants |
| 30 Mcg H1N1 Vaccine | Number of Participants Reporting Neonatal Complications | Sepsis | 0 Participants |
| 30 Mcg H1N1 Vaccine | Number of Participants Reporting Neonatal Complications | Meningitis | 0 Participants |
| 30 Mcg H1N1 Vaccine | Number of Participants Reporting Neonatal Complications | Metabolic complications | 0 Participants |
| 30 Mcg H1N1 Vaccine | Number of Participants Reporting Neonatal Complications | Respiratory complications | 3 Participants |
| 30 Mcg H1N1 Vaccine | Number of Participants Reporting Neonatal Complications | Respiratory support used | 3 Participants |
| 30 Mcg H1N1 Vaccine | Number of Participants Reporting Neonatal Complications | Fever 100.4 degrees Fahrenheit or greater | 0 Participants |
| 30 Mcg H1N1 Vaccine | Number of Participants Reporting Neonatal Complications | Congenital abnormalities | 3 Participants |
Primary
Number of Participants Reporting Solicited Quantitative Local Reactions After First Vaccination
Participants maintained a memory aid to record daily the occurrence of local reactions of redness and swelling for 8 days after vaccination (Day 0-7). If the reaction was present, the maximum diameter was measured in millimeters (mm). Participants are counted if they reported experiencing the reaction with any measurement greater than 0 mm on any of the 8 days.
Time frame: Within 8 days (Day 0-7) post first vaccination
Population: All participants receiving the first vaccination are included in the safety cohort. Analyses are as treated.
| Arm | Measure | Group | Value (NUMBER) |
|---|---|---|---|
| 15 Mcg H1N1 Vaccine | Number of Participants Reporting Solicited Quantitative Local Reactions After First Vaccination | Redness | 5 Participants |
| 15 Mcg H1N1 Vaccine | Number of Participants Reporting Solicited Quantitative Local Reactions After First Vaccination | Swelling | 4 Participants |
| 30 Mcg H1N1 Vaccine | Number of Participants Reporting Solicited Quantitative Local Reactions After First Vaccination | Redness | 8 Participants |
| 30 Mcg H1N1 Vaccine | Number of Participants Reporting Solicited Quantitative Local Reactions After First Vaccination | Swelling | 1 Participants |
Primary
Number of Participants Reporting Solicited Quantitative Local Reactions After Second Vaccination
Participants maintained a memory aid to record daily the occurrence of local reactions of redness and swelling for 8 days after vaccination (Day 0-7). If the reaction was present, the maximum diameter was measured in millimeters (mm). Participants are counted if they reported experiencing the reaction with any measurement greater than 0 mm on any of the 8 days.
Time frame: Within 8 days (Day 0-7) post second vaccination
Population: All participants receiving the second vaccination are included in the safety cohort. Analyses are as treated.
| Arm | Measure | Group | Value (NUMBER) |
|---|---|---|---|
| 15 Mcg H1N1 Vaccine | Number of Participants Reporting Solicited Quantitative Local Reactions After Second Vaccination | Swelling | 1 Participants |
| 15 Mcg H1N1 Vaccine | Number of Participants Reporting Solicited Quantitative Local Reactions After Second Vaccination | Redness | 2 Participants |
| 30 Mcg H1N1 Vaccine | Number of Participants Reporting Solicited Quantitative Local Reactions After Second Vaccination | Swelling | 0 Participants |
| 30 Mcg H1N1 Vaccine | Number of Participants Reporting Solicited Quantitative Local Reactions After Second Vaccination | Redness | 3 Participants |
Primary
Number of Participants Reporting Solicited Subjective Local Reactions After First Vaccination
Participants maintained a memory aid to record daily the occurrence of local reactions of pain, tenderness and swelling for 8 days after vaccination (Day 0-7) based on their interference with daily activities. Participants are counted if they were reported as experiencing the symptom at any severity on any of the 8 days.
Time frame: Within 8 days (Day 0-7) post first vaccination
Population: All participants receiving the first vaccination are included in the safety cohort. Analyses are as treated.
| Arm | Measure | Group | Value (NUMBER) |
|---|---|---|---|
| 15 Mcg H1N1 Vaccine | Number of Participants Reporting Solicited Subjective Local Reactions After First Vaccination | Pain | 15 Participants |
| 15 Mcg H1N1 Vaccine | Number of Participants Reporting Solicited Subjective Local Reactions After First Vaccination | Tenderness | 26 Participants |
| 15 Mcg H1N1 Vaccine | Number of Participants Reporting Solicited Subjective Local Reactions After First Vaccination | Swelling | 1 Participants |
| 30 Mcg H1N1 Vaccine | Number of Participants Reporting Solicited Subjective Local Reactions After First Vaccination | Pain | 21 Participants |
| 30 Mcg H1N1 Vaccine | Number of Participants Reporting Solicited Subjective Local Reactions After First Vaccination | Tenderness | 37 Participants |
| 30 Mcg H1N1 Vaccine | Number of Participants Reporting Solicited Subjective Local Reactions After First Vaccination | Swelling | 1 Participants |
Primary
Number of Participants Reporting Solicited Subjective Local Reactions After Second Vaccination
Participants maintained a memory aid to record daily the occurrence of local reactions of pain, tenderness and swelling for 8 days after vaccination (Day 0-7) based on their interference with daily activities. Participants are counted if they were reported as experiencing the symptom at any severity on any of the 8 days.
Time frame: Within 8 days (Day 0-7) post second vaccination
Population: All participants receiving the second vaccination are included in the safety cohort. Analyses are as treated.
| Arm | Measure | Group | Value (NUMBER) |
|---|---|---|---|
| 15 Mcg H1N1 Vaccine | Number of Participants Reporting Solicited Subjective Local Reactions After Second Vaccination | Pain | 10 Participants |
| 15 Mcg H1N1 Vaccine | Number of Participants Reporting Solicited Subjective Local Reactions After Second Vaccination | Tenderness | 26 Participants |
| 15 Mcg H1N1 Vaccine | Number of Participants Reporting Solicited Subjective Local Reactions After Second Vaccination | Swelling | 1 Participants |
| 30 Mcg H1N1 Vaccine | Number of Participants Reporting Solicited Subjective Local Reactions After Second Vaccination | Pain | 20 Participants |
| 30 Mcg H1N1 Vaccine | Number of Participants Reporting Solicited Subjective Local Reactions After Second Vaccination | Tenderness | 37 Participants |
| 30 Mcg H1N1 Vaccine | Number of Participants Reporting Solicited Subjective Local Reactions After Second Vaccination | Swelling | 0 Participants |
Primary
Number of Participants Reporting Solicited Subjective Systemic Reactions After First Vaccination
Participants maintained a memory aid to record daily the occurrence of systemic symptoms of feverishness, malaise, myalgia, headache, and nausea for 8 days after vaccination (Day 0-7) based on their interference with daily activities. Participants are counted if they reported experiencing the symptom at any severity on any of the 8 days.
Time frame: Within 8 days (Day 0-7) post first vaccination
Population: All participants receiving the first vaccination are included in the safety cohort. Analyses are as treated.
| Arm | Measure | Group | Value (NUMBER) |
|---|---|---|---|
| 15 Mcg H1N1 Vaccine | Number of Participants Reporting Solicited Subjective Systemic Reactions After First Vaccination | Malaise | 19 Participants |
| 15 Mcg H1N1 Vaccine | Number of Participants Reporting Solicited Subjective Systemic Reactions After First Vaccination | Headache | 17 Participants |
| 15 Mcg H1N1 Vaccine | Number of Participants Reporting Solicited Subjective Systemic Reactions After First Vaccination | Myalgia | 12 Participants |
| 15 Mcg H1N1 Vaccine | Number of Participants Reporting Solicited Subjective Systemic Reactions After First Vaccination | Nausea | 10 Participants |
| 15 Mcg H1N1 Vaccine | Number of Participants Reporting Solicited Subjective Systemic Reactions After First Vaccination | Feverishness | 5 Participants |
| 30 Mcg H1N1 Vaccine | Number of Participants Reporting Solicited Subjective Systemic Reactions After First Vaccination | Nausea | 12 Participants |
| 30 Mcg H1N1 Vaccine | Number of Participants Reporting Solicited Subjective Systemic Reactions After First Vaccination | Feverishness | 4 Participants |
| 30 Mcg H1N1 Vaccine | Number of Participants Reporting Solicited Subjective Systemic Reactions After First Vaccination | Malaise | 24 Participants |
| 30 Mcg H1N1 Vaccine | Number of Participants Reporting Solicited Subjective Systemic Reactions After First Vaccination | Myalgia | 8 Participants |
| 30 Mcg H1N1 Vaccine | Number of Participants Reporting Solicited Subjective Systemic Reactions After First Vaccination | Headache | 18 Participants |
Primary
Number of Participants Reporting Solicited Subjective Systemic Reactions After Second Vaccination
Participants maintained a memory aid to record daily the occurrence of systemic symptoms of feverishness, malaise, myalgia, headache, and nausea for 8 days after vaccination (Day 0-7) based on their interference with daily activities. Participants are counted if they reported experiencing the symptom at any severity on any of the 8 days.
Time frame: Within 8 days (Day 0-7) post second vaccination
Population: All participants receiving the second vaccination are included in the safety cohort. Analyses are as treated.
| Arm | Measure | Group | Value (NUMBER) |
|---|---|---|---|
| 15 Mcg H1N1 Vaccine | Number of Participants Reporting Solicited Subjective Systemic Reactions After Second Vaccination | Feverishness | 2 Participants |
| 15 Mcg H1N1 Vaccine | Number of Participants Reporting Solicited Subjective Systemic Reactions After Second Vaccination | Myalgia | 3 Participants |
| 15 Mcg H1N1 Vaccine | Number of Participants Reporting Solicited Subjective Systemic Reactions After Second Vaccination | Headache | 11 Participants |
| 15 Mcg H1N1 Vaccine | Number of Participants Reporting Solicited Subjective Systemic Reactions After Second Vaccination | Nausea | 2 Participants |
| 15 Mcg H1N1 Vaccine | Number of Participants Reporting Solicited Subjective Systemic Reactions After Second Vaccination | Malaise | 8 Participants |
| 30 Mcg H1N1 Vaccine | Number of Participants Reporting Solicited Subjective Systemic Reactions After Second Vaccination | Nausea | 4 Participants |
| 30 Mcg H1N1 Vaccine | Number of Participants Reporting Solicited Subjective Systemic Reactions After Second Vaccination | Feverishness | 4 Participants |
| 30 Mcg H1N1 Vaccine | Number of Participants Reporting Solicited Subjective Systemic Reactions After Second Vaccination | Malaise | 14 Participants |
| 30 Mcg H1N1 Vaccine | Number of Participants Reporting Solicited Subjective Systemic Reactions After Second Vaccination | Headache | 11 Participants |
| 30 Mcg H1N1 Vaccine | Number of Participants Reporting Solicited Subjective Systemic Reactions After Second Vaccination | Myalgia | 6 Participants |
Primary
Number of Participants Reporting Vaccine-associated Serious Adverse Events (SAEs)
Serious adverse events included any untoward medical occurrence that resulted in death of the mother, fetus or infant; was life threatening to mother, fetus or infant; was a persistent/significant disability/incapacity; required in-patient hospitalization or prolongation thereof; was a congenital anomaly/birth defect in fetus or infant; or may have jeopardized the mother, fetus or infant, or required intervention to prevent one of the outcomes, or was described as Guillain-Barré Syndrome. Association was determined by a clinician licensed to diagnose and listed on the site's FDA Form 1572.
Time frame: Day 0 through Day 180 after last vaccination
Population: All participants receiving the first vaccination are included in the ITT safety cohort.
| Arm | Measure | Value (NUMBER) |
|---|---|---|
| 15 Mcg H1N1 Vaccine | Number of Participants Reporting Vaccine-associated Serious Adverse Events (SAEs) | 0 Participants |
| 30 Mcg H1N1 Vaccine | Number of Participants Reporting Vaccine-associated Serious Adverse Events (SAEs) | 0 Participants |
Primary
Number of Participants With 4-fold or Greater Serum Hemagglutination Inhibition (HAI) Antibody Titer Increases Against Influenza H1N1 2009 Virus Following a Single Dose of H1N1 Vaccine
Blood was collected from all participants prior to the initial vaccination as well as 21 days after the first vaccination for testing in the HAI assay with Influenza H1N1 2009 virus as the assay antigen. A participant met the threshold of a 4-fold rise in titer if the Day 0 titer was less than 1:10 (the assay's lowest level of detection) and the Day 21 post vaccination titer was 1:40 or greater, or the Day 0 titer was greater than or equal to 1:10 and the Day 21 post vaccination titer was an increase by 4-fold or more.
Time frame: Day 0 prior to and Day 21 after the first vaccination
Population: Participants were included in the analyses if they received the first vaccination and had blood collected at both timepoints, with 5 participants excluded due to receipt of non-study vaccines. Participants were analyzed as treated.
| Arm | Measure | Value (NUMBER) |
|---|---|---|
| 15 Mcg H1N1 Vaccine | Number of Participants With 4-fold or Greater Serum Hemagglutination Inhibition (HAI) Antibody Titer Increases Against Influenza H1N1 2009 Virus Following a Single Dose of H1N1 Vaccine | 49 Participants |
| 30 Mcg H1N1 Vaccine | Number of Participants With 4-fold or Greater Serum Hemagglutination Inhibition (HAI) Antibody Titer Increases Against Influenza H1N1 2009 Virus Following a Single Dose of H1N1 Vaccine | 56 Participants |
Primary
Number of Participants With a Serum Hemagglutination Inhibition (HAI) Antibody Titer of 1:40 or Greater Against Influenza H1N1 2009 Virus Following a Single Dose of H1N1 Vaccine
Blood was collected from all participants at Day 21 post first vaccination for testing in the HAI assay with Influenza H1N1 2009 virus as the assay antigen. Each sample was tested at least twice according to standard operating procedures and the result of each replicate reported. A participant is counted if the geometric mean of the replicate values was 1:40 or greater.
Time frame: Day 21 after the first vaccination
Population: Participants were included in the analyses if they received the first vaccination and had blood collected at the timepoint, with 5 participants excluded due to receipt of non-study vaccines. Participants were analyzed as treated.
| Arm | Measure | Value (NUMBER) |
|---|---|---|
| 15 Mcg H1N1 Vaccine | Number of Participants With a Serum Hemagglutination Inhibition (HAI) Antibody Titer of 1:40 or Greater Against Influenza H1N1 2009 Virus Following a Single Dose of H1N1 Vaccine | 51 Participants |
| 30 Mcg H1N1 Vaccine | Number of Participants With a Serum Hemagglutination Inhibition (HAI) Antibody Titer of 1:40 or Greater Against Influenza H1N1 2009 Virus Following a Single Dose of H1N1 Vaccine | 56 Participants |
Secondary
Number of Participants With 4-fold or Greater Serum Hemagglutination Inhibition (HAI) Antibody Titer Increases Against Influenza H1N1 2009 Virus Following 2 Doses of H1N1 Vaccine
Blood was collected from all participants prior to the initial vaccination as well as 21 days after the second vaccination for testing in the HAI assay with Influenza H1N1 2009 virus as the assay antigen. A participant met the threshold of a 4-fold rise in titer if the Day 0 titer was less than 1:10 (the assay's lowest level of detection) and the Day 21 post vaccination 2 titer was 1:40 or greater, or the Day 0 titer was greater than or equal to 1:10 and the Day 21 post vaccination 2 titer was an increase by 4-fold or more.
Time frame: Day 0 prior to first vaccination and Day 21 after the second vaccination
Population: Participants were included in the analyses if they received both vaccinations within 4 days of the window and had blood collected at both timepoints, with 13 participants excluded due to receipt of non-study vaccines. Participants were analyzed as treated.
| Arm | Measure | Value (NUMBER) |
|---|---|---|
| 15 Mcg H1N1 Vaccine | Number of Participants With 4-fold or Greater Serum Hemagglutination Inhibition (HAI) Antibody Titer Increases Against Influenza H1N1 2009 Virus Following 2 Doses of H1N1 Vaccine | 36 Participants |
| 30 Mcg H1N1 Vaccine | Number of Participants With 4-fold or Greater Serum Hemagglutination Inhibition (HAI) Antibody Titer Increases Against Influenza H1N1 2009 Virus Following 2 Doses of H1N1 Vaccine | 47 Participants |
Secondary
Number of Participants With a Serum Hemagglutination Inhibition Assay (HAI) Antibody Titer Greater Than or Equal to 40 Against the Novel Influenza H1N1 2009 Virus in Cord Blood
Cord blood was collected at the time of delivery for testing in the HAI assay with Influenza H1N1 2009 virus as the assay antigen. Each sample was tested at least twice according to standard operating procedures and the result of each replicate reported. A participant is counted if the geometric mean of the replicate values was 1:40 or greater.
Time frame: At time of delivery
Population: Participants were included in the analyses if a cord blood sample was collected at delivery, with 22 participants excluded due to receipt of non-study vaccines and 5 due to specimen processing errors at the time of sample collection.
| Arm | Measure | Value (NUMBER) |
|---|---|---|
| 15 Mcg H1N1 Vaccine | Number of Participants With a Serum Hemagglutination Inhibition Assay (HAI) Antibody Titer Greater Than or Equal to 40 Against the Novel Influenza H1N1 2009 Virus in Cord Blood | 34 Participants |
| 30 Mcg H1N1 Vaccine | Number of Participants With a Serum Hemagglutination Inhibition Assay (HAI) Antibody Titer Greater Than or Equal to 40 Against the Novel Influenza H1N1 2009 Virus in Cord Blood | 41 Participants |
Secondary
Number of Participants With a Serum Hemagglutination Inhibition Assay (HAI) Antibody Titer Greater Than or Equal to 40 Against the Novel Influenza H1N1 2009 Virus in the Maternal Blood at the Time of Delivery
Blood was collected from participants at the time of delivery for testing in the HAI assay with Influenza H1N1 2009 virus as the assay antigen. Each sample was tested at least twice according to standard operating procedures and the result of each replicate reported. A participant is counted if the geometric mean of the replicate values was 1:40 or greater.
Time frame: At time of delivery
Population: Participants were included in the analyses if they had blood collected at delivery, with 22 participants excluded due to receipt of non-study vaccines and 3 due to specimen processing errors at the time of sample collection. Participants were analyzed as treated.
| Arm | Measure | Value (NUMBER) |
|---|---|---|
| 15 Mcg H1N1 Vaccine | Number of Participants With a Serum Hemagglutination Inhibition Assay (HAI) Antibody Titer Greater Than or Equal to 40 Against the Novel Influenza H1N1 2009 Virus in the Maternal Blood at the Time of Delivery | 35 Participants |
| 30 Mcg H1N1 Vaccine | Number of Participants With a Serum Hemagglutination Inhibition Assay (HAI) Antibody Titer Greater Than or Equal to 40 Against the Novel Influenza H1N1 2009 Virus in the Maternal Blood at the Time of Delivery | 29 Participants |
Secondary
Number of Participants With a Serum Hemagglutination Inhibition (HAI) Antibody Titer of 1:40 or Greater Against Influenza H1N1 2009 Virus Following 2 Doses of H1N1 Vaccine
Blood was collected from all participants at Day 21 post second vaccination for testing in the HAI assay with Influenza H1N1 2009 virus as the assay antigen. Each sample was tested at least twice according to standard operating procedures and the result of each replicate reported. A participant is counted if the geometric mean of the replicate values was 1:40 or greater.
Time frame: Day 21 after the second vaccination
Population: Participants were included in the analyses if they received both vaccinations within 4 days of the window and had blood collected at both timepoints, with 13 participants excluded due to receipt of non-study vaccines. Participants were analyzed as treated.
| Arm | Measure | Value (NUMBER) |
|---|---|---|
| 15 Mcg H1N1 Vaccine | Number of Participants With a Serum Hemagglutination Inhibition (HAI) Antibody Titer of 1:40 or Greater Against Influenza H1N1 2009 Virus Following 2 Doses of H1N1 Vaccine | 36 Participants |
| 30 Mcg H1N1 Vaccine | Number of Participants With a Serum Hemagglutination Inhibition (HAI) Antibody Titer of 1:40 or Greater Against Influenza H1N1 2009 Virus Following 2 Doses of H1N1 Vaccine | 47 Participants |