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Immunogenicity of Fluzone High Dose in Immunocompromised Children and Young Adults

Immunogenicity and Efficacy of High-dose Trivalent Inactivated Seasonal Influenza Vaccine (Fluzone High Dose) in Immunocompromised Children and Young Adults.

Status
Completed
Phases
Phase 2
Study type
Interventional
Source
ClinicalTrials.gov
Registry ID
NCT01685372
Enrollment
16
Registered
2012-09-14
Start date
2012-09-30
Completion date
2017-09-30
Last updated
2018-01-23

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Solid Organ Transplant Recipient (Liver, Kidney, Heart), Rheumatologic Disorder, Human Immunodeficiency Virus (HIV), Bone Marrow Transplant (BMT), Dialysis

Brief summary

The purpose of this study is to determine whether Fluzone High Dose increases the immune response to the influenza antigens contained in the vaccine compared to standard-dose Fluzone in immunocompromised children and young adults. Safety and efficacy data will also be collected.

Interventions

A single-dose of high-dose influenza vaccine will be administered to subjects randomized to this arm

BIOLOGICALFluzone

A single-dose of standard-dose influenza vaccine will be administered to subjects randomized to this arm

Sponsors

Colorado Clinical & Translational Sciences Institute
CollaboratorOTHER
University of Colorado, Denver
Lead SponsorOTHER

Study design

Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
PREVENTION
Masking
TRIPLE (Subject, Caregiver, Investigator)

Eligibility

Sex/Gender
ALL
Age
5 Years to 35 Years
Healthy volunteers
No

Inclusion criteria

* Age ≥ 5 years and ≤ 35 years * Receiving influenza vaccination in Children's Hospital Colorado (CHC) clinic as part of routine clinical care * Only supposed to receive one dose of influenza vaccine * Rheumatology patients: must be on some type of immunosuppressive or immunomodulatory medication at the time of immunization and considered at least moderately immunosuppressed in the opinion of the primary rheumatologist. Basic guidelines for rheumatology patients: (1) Any patient receiving monoclonal antibody therapy (i.e., infliximab, etanercept, tocilizumab, anakinra) must also be taking another immunosuppressive/immunomodulatory medication; (2) Patients taking steroids as monotherapy must be on a dose of ≥ 2mg/kg/day OR ≥ 20mg/day; (3) Patients on combination therapy where the dose of a single drug may not be very high, but the combination is considered moderately or severely immunosuppressive will be eligible. * Bone Marrow Transplant patients: all patients in clinic eligible * Oncology patients: must be on some type of chemotherapy * Hemodialysis patients: must be on dialysis * Child Health Immunodeficiency Program (CHIP) patients: must have a known diagnosis of HIV * Solid Organ Transplant patients: post-transplant, influenza vaccine recommended by primary transplant physician

Exclusion criteria

* Rheumatology patients: if receiving any of the monoclonal antibodies, etanercept, infliximab, adalimumab, tocilizumab, atlizumab, or anakinra, must also be taking at least one other immunosuppressive/immunomodulatory medication * Unable to come for scheduled follow-up appointments * History of anaphylaxis reaction to influenza vaccination in the past * Severe allergic reaction to any component of the vaccine, including egg protein, or after previous dose of any influenza vaccine * History of Guillain-Barre syndrome ever in the past in the subject or in a parent or a sibling of the subject * Allergy to latex * Intravenous immuneglobulin (IVIG) within in 4 weeks preceding any blood draw * Receiving an investigational agent as part of another study or other medical treatment (investigational = not-FDA approved for any indication) * Subject not enrolled in other studies that prohibit him/her from enrolling in this study * Blood draw contraindicated * Pregnancy * Breastfeeding * Received a polysaccharide vaccine (pneumovax) w/in 3 weeks of the vaccination * Absolute neutrophil count (ANC) \< 500/uL at the time of vaccination or could potentially have ANC 500/uL during the 5 days after vaccination * Platelet count \< 50,000/uL at the time of vaccination * If a subject has a temperature ≥ 100.4°F at the time of enrollment, then the subject must choose to not enroll or delay immunization until afebrile. * Receiving influenza vaccination past December 15 of influenza season.

Design outcomes

Primary

MeasureTime frameDescription
Number of Subjects Seroprotected at Timepoint 2 in High Dose and Standard Dose Vaccination Groupsblood draw at 10-45 days post-vaccinationMeasure hemagglutinin inhibition (HAI) on blood samples #2 for all subjects, which is the sample drawn at the peak of the immune response. Compare number of subjects who are seroprotected (reaching HAI ≥ 1:40) between the high-dose and standard-dose recipients..
Number of Episodes of Influenza and Influenza-Like-Illness Reported in High Dose and Standard Dose Vaccination Groupsup to 10 months after vaccinationGathered data on influenza and influenza-like-illness during the influenza season for which the subject was vaccinated. Reported numbers of episodes of PCR-diagnosed influenza and rates of reported Influenza-Like-Illness (ILI) from Questionnaire #2 and also that were obtained from medical records. Data were categorized by the following: 1. Polymerase chain reaction (PCR)-proven diagnosis of influenza performed at Children's Hospital Colorado (CHC) 2. Diagnosis of influenza by non-PCR rapid-influenza test 3. Diagnosis of ILI (from questionnaire #2). \[Centers for Disease Control (CDC) definition of ILI: Fever ≥ 100°F AND cough or sore throat in the absence of another known cause other than influenza for the illness.\]

Secondary

MeasureTime frameDescription
Number of Subjects With Seroconversion From T1 to T2 in the High Dose and Standard Dose Vaccine Groups10-45 days post-vaccinationHAI was measured on blood samples #1 and #2 for all subjects. Seroconversion is defined as a four-fold increase in antibody level between the high-dose and standard-dose recipients within each patient group was performed.
Change in Disease Status From Vaccination Through June of the Following Yearup to 9 months post-vaccinationEvaluate disease status changes reported by subject on Questionnaire #2 as well as changes reported in clinic notes over the course of the influenza season. Subjects considered worse had worsening function of transplanted organ or complications related to underlying condition (e.g. dialysis) or new diagnosis of disease considered serious by PI.
Number of Adverse Events Considered Definitely or Possibly Related to Vaccination Through Sept 30 of the Year Following Vaccination.(1) Date of vaccine through day 30 post-vaccine; (2) Day 31 post-vaccine through September 30 of the year following vaccineData gathered from the following 1. Safety data in 1st 14 days (safety surveys and safety diary) 2. Safety survey at day 30-45 regarding any unplanned health care visit or other AE during the 30 days after vaccine 3. On-going passive surveillance of adverse events (AEs)/serious adverse events (SAEs) throughout course of influenza season of enrollment 4. Chart review of each participant by PI through Sept 30 of the year following vaccine Data collection stopped in September following enrollment.
Number of Participants Seroprotected at Timepoint 3 in High Dose and Standard Dose Vaccination Groupsat least 5 months post vaccinationMeasure HAI on blood sample #3, drawn May-September following vaccination. Report number who still have HAI ≥ 1:40 in the high-dose and standard-dose groups.
Number of Adverse Events Definitely or Possibly Related to Vaccination Reported Within 14 Days of Vaccination0-14 days after vaccinationNumber of adverse events reported within the 14 days after vaccination by each subject within each patient group. Data collected from that reported in safety questionnaires and in Safety Diary that spanned the 14 days post-vaccination.

Other

MeasureTime frameDescription
Additional Measures of Immunogenicity in High Dose and Standard Dose Vaccinations10-45 days post-vaccinationThis secondary objective was included as exploratory and we plan to add additional analyses when funding is secured. There is no anticipated date when we will have this completed. (No immunogenicity studies have been done besides HAI.) For other immunogenicity: would compare results of blood draw #1 and #2 between the high-dose and standard-dose recipients for each patient group for any of the following: antibody avidity, microneutralization, T-cell interferon, T-cell IL-2, B-cell Immunoglobulin G (IgG) and B-cell Immunoglobulin A (IgA).
Numbers of Subjects Who Were Both Seroprotected and Who Seroconverted at T2 and T3 After Vaccination(1) T2 measured 14-45 days post-vaccination; (2) T3 measured June 1-Sept 30 post-vaccination (end-of season), following vaccinationSeroprotection (HAI\>=1:40) and seroconversion (4-fold increase) together have been found to be a better predictor of vaccine effectiveness. Patients had to have both a 4-fold rise in HAI and have HAI\>=40 to be counted

Countries

United States

Participant flow

Recruitment details

Study subjects were recruited over two influenza seasons, 2013-2014 and 2014-2015. Subjects were recruited from the Dialysis unit and Rheumatology clinic in 2013-2014 by referral from clinicians. Subjects were recruited by mailed letter to Solid Organ Transplant recipients in 2014-2015.

Pre-assignment details

In 2013-2014, 4 subjects chose not to enroll after learning more about the study. In 2014-2015, 2 subjects chose not to enroll after learning about the study. All potential subjects met pre-screening criteria. No subjects were excluded from the study by study personnel.

Participants by arm

ArmCount
Fluzone High Dose
Fluzone High Dose 0.5 mL intramuscularly (IM) given once Fluzone High Dose: A single-dose of high-dose influenza vaccine will be administered to subjects randomized to this arm
7
Fluzone Standard Dose
Fluzone 0.5mL IM given once Fluzone: A single-dose of standard-dose influenza vaccine will be administered to subjects randomized to this arm
9
Total16

Withdrawals & dropouts

PeriodReasonFG000FG001
Timepoint 3 (T3): 3rd Blood DrawLost to Follow-up34

Baseline characteristics

CharacteristicTotalFluzone Standard DoseFluzone High Dose
Age, Continuous15 years15 years15 years
Cohort
Dialysis
7 Participants4 Participants3 Participants
Cohort
Rheumatoloty
1 Participants1 Participants0 Participants
Cohort
Solid organ transplant
8 Participants4 Participants4 Participants
Ethnicity (NIH/OMB)
Hispanic or Latino
6 Participants4 Participants2 Participants
Ethnicity (NIH/OMB)
Not Hispanic or Latino
10 Participants5 Participants5 Participants
Ethnicity (NIH/OMB)
Unknown or Not Reported
0 Participants0 Participants0 Participants
Race (NIH/OMB)
American Indian or Alaska Native
0 Participants0 Participants0 Participants
Race (NIH/OMB)
Asian
1 Participants1 Participants0 Participants
Race (NIH/OMB)
Black or African American
0 Participants0 Participants0 Participants
Race (NIH/OMB)
More than one race
1 Participants0 Participants1 Participants
Race (NIH/OMB)
Native Hawaiian or Other Pacific Islander
0 Participants0 Participants0 Participants
Race (NIH/OMB)
Unknown or Not Reported
0 Participants0 Participants0 Participants
Race (NIH/OMB)
White
14 Participants8 Participants6 Participants
Sex: Female, Male
Female
10 Participants5 Participants5 Participants
Sex: Female, Male
Male
6 Participants4 Participants2 Participants

Adverse events

Event typeEG000
affected / at risk
EG001
affected / at risk
deaths
Total, all-cause mortality
0 / 70 / 9
other
Total, other adverse events
6 / 77 / 9
serious
Total, serious adverse events
1 / 71 / 9

Outcome results

Primary

Number of Episodes of Influenza and Influenza-Like-Illness Reported in High Dose and Standard Dose Vaccination Groups

Gathered data on influenza and influenza-like-illness during the influenza season for which the subject was vaccinated. Reported numbers of episodes of PCR-diagnosed influenza and rates of reported Influenza-Like-Illness (ILI) from Questionnaire #2 and also that were obtained from medical records. Data were categorized by the following: 1. Polymerase chain reaction (PCR)-proven diagnosis of influenza performed at Children's Hospital Colorado (CHC) 2. Diagnosis of influenza by non-PCR rapid-influenza test 3. Diagnosis of ILI (from questionnaire #2). \[Centers for Disease Control (CDC) definition of ILI: Fever ≥ 100°F AND cough or sore throat in the absence of another known cause other than influenza for the illness.\]

Time frame: up to 10 months after vaccination

Population: Row 1: Number of influenza episodes diagnosed by PCR Row 2: Number of influenza episodes diagnosed by non-PCR rapid test Row 3: Number of influenza-like-illness (ILI) episodes reported by participants from the time of vaccination through June of the following year (end of flu season).

ArmMeasureGroupValue (NUMBER)
Fluzone High DoseNumber of Episodes of Influenza and Influenza-Like-Illness Reported in High Dose and Standard Dose Vaccination GroupsRow 1: Number of Influenza diagnosed by PCR1 episodes of illness
Fluzone High DoseNumber of Episodes of Influenza and Influenza-Like-Illness Reported in High Dose and Standard Dose Vaccination GroupsRow 2: # of Influenza diagnosis by non-PCR test0 episodes of illness
Fluzone High DoseNumber of Episodes of Influenza and Influenza-Like-Illness Reported in High Dose and Standard Dose Vaccination GroupsRow 3: Number of Influenza-like-illness2 episodes of illness
Fluzone Standard DoseNumber of Episodes of Influenza and Influenza-Like-Illness Reported in High Dose and Standard Dose Vaccination GroupsRow 1: Number of Influenza diagnosed by PCR1 episodes of illness
Fluzone Standard DoseNumber of Episodes of Influenza and Influenza-Like-Illness Reported in High Dose and Standard Dose Vaccination GroupsRow 2: # of Influenza diagnosis by non-PCR test0 episodes of illness
Fluzone Standard DoseNumber of Episodes of Influenza and Influenza-Like-Illness Reported in High Dose and Standard Dose Vaccination GroupsRow 3: Number of Influenza-like-illness8 episodes of illness
Primary

Number of Subjects Seroprotected at Timepoint 2 in High Dose and Standard Dose Vaccination Groups

Measure hemagglutinin inhibition (HAI) on blood samples #2 for all subjects, which is the sample drawn at the peak of the immune response. Compare number of subjects who are seroprotected (reaching HAI ≥ 1:40) between the high-dose and standard-dose recipients..

Time frame: blood draw at 10-45 days post-vaccination

Population: All participants had blood drawn before vaccination and at timepoint 2. The influenza vaccine had the same subtypes during the two season. Data were analyzed for the 3 subtypes contained in the trivalent vaccine, H1N1, H3N2, B (Yamagata).

ArmMeasureGroupValue (COUNT_OF_PARTICIPANTS)
Fluzone High DoseNumber of Subjects Seroprotected at Timepoint 2 in High Dose and Standard Dose Vaccination GroupsH1N17 Participants
Fluzone High DoseNumber of Subjects Seroprotected at Timepoint 2 in High Dose and Standard Dose Vaccination GroupsH3N27 Participants
Fluzone High DoseNumber of Subjects Seroprotected at Timepoint 2 in High Dose and Standard Dose Vaccination GroupsB (Yamagata)7 Participants
Fluzone Standard DoseNumber of Subjects Seroprotected at Timepoint 2 in High Dose and Standard Dose Vaccination GroupsH1N17 Participants
Fluzone Standard DoseNumber of Subjects Seroprotected at Timepoint 2 in High Dose and Standard Dose Vaccination GroupsH3N29 Participants
Fluzone Standard DoseNumber of Subjects Seroprotected at Timepoint 2 in High Dose and Standard Dose Vaccination GroupsB (Yamagata)8 Participants
Secondary

Change in Disease Status From Vaccination Through June of the Following Year

Evaluate disease status changes reported by subject on Questionnaire #2 as well as changes reported in clinic notes over the course of the influenza season. Subjects considered worse had worsening function of transplanted organ or complications related to underlying condition (e.g. dialysis) or new diagnosis of disease considered serious by PI.

Time frame: up to 9 months post-vaccination

Population: One subject in the high-dose group was originally on dialysis, but received a kidney transplant during the follow-up period. This subject was excluded from the analysis on change in baseline medical condition.

ArmMeasureGroupValue (COUNT_OF_PARTICIPANTS)
Fluzone High DoseChange in Disease Status From Vaccination Through June of the Following YearSame or better5 Participants
Fluzone High DoseChange in Disease Status From Vaccination Through June of the Following YearWorse1 Participants
Fluzone Standard DoseChange in Disease Status From Vaccination Through June of the Following YearSame or better9 Participants
Fluzone Standard DoseChange in Disease Status From Vaccination Through June of the Following YearWorse0 Participants
Secondary

Number of Adverse Events Considered Definitely or Possibly Related to Vaccination Through Sept 30 of the Year Following Vaccination.

Data gathered from the following 1. Safety data in 1st 14 days (safety surveys and safety diary) 2. Safety survey at day 30-45 regarding any unplanned health care visit or other AE during the 30 days after vaccine 3. On-going passive surveillance of adverse events (AEs)/serious adverse events (SAEs) throughout course of influenza season of enrollment 4. Chart review of each participant by PI through Sept 30 of the year following vaccine Data collection stopped in September following enrollment.

Time frame: (1) Date of vaccine through day 30 post-vaccine; (2) Day 31 post-vaccine through September 30 of the year following vaccine

Population: Data used included: active reporting through day 30, survey at end of season, and chart review for data through Sept 30 of the year following vaccination.

ArmMeasureGroupValue (NUMBER)
Fluzone High DoseNumber of Adverse Events Considered Definitely or Possibly Related to Vaccination Through Sept 30 of the Year Following Vaccination.Day 0 (vaccination) through day 3010 number of AEs reported
Fluzone High DoseNumber of Adverse Events Considered Definitely or Possibly Related to Vaccination Through Sept 30 of the Year Following Vaccination.Day 31 post-vaccination, through Sept 300 number of AEs reported
Fluzone Standard DoseNumber of Adverse Events Considered Definitely or Possibly Related to Vaccination Through Sept 30 of the Year Following Vaccination.Day 0 (vaccination) through day 309 number of AEs reported
Fluzone Standard DoseNumber of Adverse Events Considered Definitely or Possibly Related to Vaccination Through Sept 30 of the Year Following Vaccination.Day 31 post-vaccination, through Sept 300 number of AEs reported
Secondary

Number of Adverse Events Definitely or Possibly Related to Vaccination Reported Within 14 Days of Vaccination

Number of adverse events reported within the 14 days after vaccination by each subject within each patient group. Data collected from that reported in safety questionnaires and in Safety Diary that spanned the 14 days post-vaccination.

Time frame: 0-14 days after vaccination

Population: All adverse events that may have been related are included in this analysis. Events considered not-related were excluded. More information on these AEs is included in the Adverse Events section. All AEs were reviewed by the study DSMB.

ArmMeasureGroupValue (NUMBER)
Fluzone High DoseNumber of Adverse Events Definitely or Possibly Related to Vaccination Reported Within 14 Days of VaccinationOther AEs - Grade 12 number of AEs reported
Fluzone High DoseNumber of Adverse Events Definitely or Possibly Related to Vaccination Reported Within 14 Days of VaccinationLocal site reaction - grade 17 number of AEs reported
Fluzone High DoseNumber of Adverse Events Definitely or Possibly Related to Vaccination Reported Within 14 Days of VaccinationLocal site reaction - grade 21 number of AEs reported
Fluzone Standard DoseNumber of Adverse Events Definitely or Possibly Related to Vaccination Reported Within 14 Days of VaccinationLocal site reaction - grade 18 number of AEs reported
Fluzone Standard DoseNumber of Adverse Events Definitely or Possibly Related to Vaccination Reported Within 14 Days of VaccinationLocal site reaction - grade 20 number of AEs reported
Fluzone Standard DoseNumber of Adverse Events Definitely or Possibly Related to Vaccination Reported Within 14 Days of VaccinationOther AEs - Grade 11 number of AEs reported
Secondary

Number of Participants Seroprotected at Timepoint 3 in High Dose and Standard Dose Vaccination Groups

Measure HAI on blood sample #3, drawn May-September following vaccination. Report number who still have HAI ≥ 1:40 in the high-dose and standard-dose groups.

Time frame: at least 5 months post vaccination

Population: Number of subjects seroprotected at T3 for each of the vaccine subtypes. 3 subjects in the HD group and 4 subjects in the SD group were lost-to-follow-up by T3 and not included in this analysis.

ArmMeasureGroupValue (COUNT_OF_PARTICIPANTS)
Fluzone High DoseNumber of Participants Seroprotected at Timepoint 3 in High Dose and Standard Dose Vaccination GroupsH1N14 Participants
Fluzone High DoseNumber of Participants Seroprotected at Timepoint 3 in High Dose and Standard Dose Vaccination GroupsH3N24 Participants
Fluzone High DoseNumber of Participants Seroprotected at Timepoint 3 in High Dose and Standard Dose Vaccination GroupsB (Yamagata)4 Participants
Fluzone Standard DoseNumber of Participants Seroprotected at Timepoint 3 in High Dose and Standard Dose Vaccination GroupsH1N14 Participants
Fluzone Standard DoseNumber of Participants Seroprotected at Timepoint 3 in High Dose and Standard Dose Vaccination GroupsH3N25 Participants
Fluzone Standard DoseNumber of Participants Seroprotected at Timepoint 3 in High Dose and Standard Dose Vaccination GroupsB (Yamagata)5 Participants
Secondary

Number of Subjects With Seroconversion From T1 to T2 in the High Dose and Standard Dose Vaccine Groups

HAI was measured on blood samples #1 and #2 for all subjects. Seroconversion is defined as a four-fold increase in antibody level between the high-dose and standard-dose recipients within each patient group was performed.

Time frame: 10-45 days post-vaccination

Population: All participants had blood drawn at baseline (T1) and 10-45 days after vaccination (T2). Analysis was done for the 3 influenza subtypes in the trivalent influenza vaccine. The influenza vaccine was the same in 2013-2014 and 2014-2015.

ArmMeasureGroupValue (COUNT_OF_PARTICIPANTS)
Fluzone High DoseNumber of Subjects With Seroconversion From T1 to T2 in the High Dose and Standard Dose Vaccine GroupsH1N13 Participants
Fluzone High DoseNumber of Subjects With Seroconversion From T1 to T2 in the High Dose and Standard Dose Vaccine GroupsH3N25 Participants
Fluzone High DoseNumber of Subjects With Seroconversion From T1 to T2 in the High Dose and Standard Dose Vaccine GroupsB (Yamagata)3 Participants
Fluzone Standard DoseNumber of Subjects With Seroconversion From T1 to T2 in the High Dose and Standard Dose Vaccine GroupsH1N11 Participants
Fluzone Standard DoseNumber of Subjects With Seroconversion From T1 to T2 in the High Dose and Standard Dose Vaccine GroupsH3N25 Participants
Fluzone Standard DoseNumber of Subjects With Seroconversion From T1 to T2 in the High Dose and Standard Dose Vaccine GroupsB (Yamagata)3 Participants
Other Pre-specified

Additional Measures of Immunogenicity in High Dose and Standard Dose Vaccinations

This secondary objective was included as exploratory and we plan to add additional analyses when funding is secured. There is no anticipated date when we will have this completed. (No immunogenicity studies have been done besides HAI.) For other immunogenicity: would compare results of blood draw #1 and #2 between the high-dose and standard-dose recipients for each patient group for any of the following: antibody avidity, microneutralization, T-cell interferon, T-cell IL-2, B-cell Immunoglobulin G (IgG) and B-cell Immunoglobulin A (IgA).

Time frame: 10-45 days post-vaccination

Other Pre-specified

Numbers of Subjects Who Were Both Seroprotected and Who Seroconverted at T2 and T3 After Vaccination

Seroprotection (HAI\>=1:40) and seroconversion (4-fold increase) together have been found to be a better predictor of vaccine effectiveness. Patients had to have both a 4-fold rise in HAI and have HAI\>=40 to be counted

Time frame: (1) T2 measured 14-45 days post-vaccination; (2) T3 measured June 1-Sept 30 post-vaccination (end-of season), following vaccination

Population: For T3, only 4 participants in the high-dose group and 5 participants in the standard-dose group were analyzed due to loss-to-follow-up.

ArmMeasureGroupValue (COUNT_OF_PARTICIPANTS)
Fluzone High DoseNumbers of Subjects Who Were Both Seroprotected and Who Seroconverted at T2 and T3 After VaccinationT2 - H1N13 Participants
Fluzone High DoseNumbers of Subjects Who Were Both Seroprotected and Who Seroconverted at T2 and T3 After VaccinationT2 - H3N25 Participants
Fluzone High DoseNumbers of Subjects Who Were Both Seroprotected and Who Seroconverted at T2 and T3 After VaccinationT2 - B (Yamagata)3 Participants
Fluzone High DoseNumbers of Subjects Who Were Both Seroprotected and Who Seroconverted at T2 and T3 After VaccinationT3 - H1N11 Participants
Fluzone High DoseNumbers of Subjects Who Were Both Seroprotected and Who Seroconverted at T2 and T3 After VaccinationT3 - H3N20 Participants
Fluzone High DoseNumbers of Subjects Who Were Both Seroprotected and Who Seroconverted at T2 and T3 After VaccinationT3 - B (Yamagata)1 Participants
Fluzone Standard DoseNumbers of Subjects Who Were Both Seroprotected and Who Seroconverted at T2 and T3 After VaccinationT3 - H3N21 Participants
Fluzone Standard DoseNumbers of Subjects Who Were Both Seroprotected and Who Seroconverted at T2 and T3 After VaccinationT2 - H1N11 Participants
Fluzone Standard DoseNumbers of Subjects Who Were Both Seroprotected and Who Seroconverted at T2 and T3 After VaccinationT3 - H1N10 Participants
Fluzone Standard DoseNumbers of Subjects Who Were Both Seroprotected and Who Seroconverted at T2 and T3 After VaccinationT2 - H3N25 Participants
Fluzone Standard DoseNumbers of Subjects Who Were Both Seroprotected and Who Seroconverted at T2 and T3 After VaccinationT3 - B (Yamagata)0 Participants
Fluzone Standard DoseNumbers of Subjects Who Were Both Seroprotected and Who Seroconverted at T2 and T3 After VaccinationT2 - B (Yamagata)3 Participants

Source: ClinicalTrials.gov · Data processed: Feb 4, 2026