Asthma, Asthma in Children, Influenza, Vaccine Adverse Reaction, Vaccine Reaction, Wheezing
Conditions
Keywords
asthma, influenza vaccine, inactivated influenza vaccine, live attenuated influenza vaccine
Brief summary
This is a prospective randomized, open label clinical trial in approximately 300 children aged 5-11 years with a physician diagnosis of persistent asthma. Participants will be randomized 1:1 to receive either a single intranasal dose of licensed quadrivalent LAIV (LAIV4) or an intramuscular injection of quadrivalent IIV4 (IIV4).
Detailed description
The study will be conducted at three sites: Vanderbilt University Medical Center (Lead site), Cincinnati Children's Hospital Medical Center (contributing site), and Duke University Medical Center (contributing site) during the 2018-2019 influenza season. Participants will be randomized 1:1 to receive either a single intranasal dose of licensed quadrivalent LAIV (LAIV4) or an intramuscular injection of quadrivalent IIV4 (IIV4), stratifying by asthma severity (mild vs. moderate-to-severe). Vanderbilt will enroll about 100 participants, Cincinnati will enroll about 110 participants, and Duke will enroll about 90 participants. After enrollment, participants will be followed for 43 days via 5 additional phone, email, or text visits to monitor systemic reactogenicity, asthma symptoms and exacerbations, and serious adverse events. The primary objective is to compare proportions of participants with asthma exacerbations during the 42 days after LAIV4 versus IIV4. Because of the potential for increased risk of wheezing after LAIV, the use of LAIV in persons with asthma has been an area of vaccine safety research for many years; the safety issue remains unresolved. A clinical study to assess the safety of LAIV4 in children with asthma could expand the evidence base and inform clinical decision-making and public health policy.
Interventions
BIOLOGICALLive Attenuated Influenza Vaccine (LAIV)
1 dose, 0.2 mL, intranasal administration
BIOLOGICALInactivated Influenza Vaccine (IIV)
1 dose, 0.5 mL, intramuscular administration
Sponsors
Centers for Disease Control and Prevention
Duke University
Children's Hospital Medical Center, Cincinnati
Vanderbilt University Medical Center
Study design
Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
PREVENTION
Masking
NONE
Eligibility
Sex/Gender
ALL
Age
5 Years to 11 Years
Healthy volunteers
Yes
Inclusion criteria
* Children between 5-11 years of age, inclusive, at enrollment * Participant must have a current diagnosis of persistent asthma (Physician diagnosis of asthma and current prescribed use of a long-acting controller medication. For purposes of this study, we have considered controller medications to be any single or combination use of long-acting medications used to prevent asthma exacerbations and to achieve long-term control of asthma (as compared to short-acting rescue medication).) * Parent(s) or legal guardian(s) must provide written, informed consent and participant must provide assent as appropriate for age prior to initiation of study procedures and according to local IRB requirements * Parent(s) or legal guardian(s) and participant must be willing and able to comply with planned study procedures and be available for all study visits * Is in good health, other than their asthma, as determined by medical history * English or Spanish literate (only English-speaking participants will be included at the Cincinnati and Duke sites) * Intention of being available for entire study period and complete all relevant study procedures, including follow-up using at least one of the following methods: phone calls, text messages, or emails
Exclusion criteria
* Acute illness and/or a reported oral temperature of ≥ 100.4°F within 72 hours prior to enrollment (this may result in a temporary delay of vaccination) * Use of antipyretic medication during the preceding 24 hours that might mask a fever (this may result in a temporary delay of vaccination) * History of a severe allergic reaction (e.g., anaphylaxis) after a previous dose of any influenza vaccine or after any component of the influenza vaccine, including egg protein. * Receipt of any licensed vaccine within 14 days (for inactivated vaccines) or 28 days (for live vaccines) prior to vaccination or planned receipt of any licensed vaccine within 42 days after vaccination * Receipt of current year's (2018-2019 influenza season) licensed influenza vaccine for children 9-11 years (only). (Clarification: Children aged 5-8 years are permitted to be enrolled if they have received zero or one dose of the 2018-2019 influenza season vaccine, and require two doses of the 2018-2019 influenza vaccine.) * Received an investigational agent (licensed or unlicensed vaccine, drug, biologic, device, blood product, or medication) in the 28 days prior to enrollment or planned receipt before 42 days after vaccination * Have immunosuppression as a result of an underlying illness or treatment, or use of anticancer chemotherapy or radiation therapy within the preceding 36 months * Have taken ≥20mg/day of prednisone or its equivalent, for 14 days or more within the past 28 days * Have known active neoplasm or a history of any hematologic malignancy * Has had a previous exacerbation of their asthma symptoms requiring systemic steroids within the prior 28 days, or has had a life-threatening exacerbation of asthma in the past two years (e.g. hypoxic seizure, mechanical ventilation) * Received influenza antiviral medication within 48 hours prior to study vaccination * History of Guillian-Barré syndrome within 6 weeks of previous influenza vaccination * Have any condition that, in the opinion of the investigator, would interfere with the evaluation of the responses or would place the participant at unacceptable risk of injury * Has a positive urine or serum pregnancy test within 24 hours prior to vaccination in a post-menarchal female. LAIV is not recommended for use in pregnant females. * Currently taking aspirin or aspirin-containing products * Any parent(s) or legal guardian(s) who is an immediate relative of study staff or is an employee supervised by study staff.
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Comparison of the Proportion of Participants Experiencing an Asthma Exacerbation During the 42 Days After LAIV4 vs. IIV4 (Until Day 43). | Day 43 | For this study, asthma exacerbation will be defined as: any acute episode of progressively worsening shortness of breath (dyspnea), cough, wheezing, chest tightness, and/or respiratory distress during the 42 days (until day 43) after influenza vaccination for which the patient seeks unscheduled medical attention (e.g., healthcare provider office or Emergency Department visit or hospitalization) or receives a new prescription for systemic corticosteroids. |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Comparison of the Proportion of Participants Experiencing an Asthma Exacerbation During the 14 Days After LAIV4 vs. IIV4 | Day 15 | For this study, asthma exacerbation will be defined as: any acute episode of progressively worsening shortness of breath (dyspnea), cough, wheezing, chest tightness, and/or respiratory distress during the 14 days (until day 15) after influenza vaccination for which the patient seeks unscheduled medical attention (e.g., healthcare provider office or Emergency Department visit or hospitalization) or receives a new prescription for systemic corticosteroids. |
| Comparison of the Proportion of Participants With Asthma Symptoms and Unscheduled Albuterol Use During the 14 Days After Receipt of LAIV4 or IIV4 (Each is Assessed Separately). | Day 15 | Cough, wheezing, tightness in chest, nighttime awakening and unscheduled albuterol use will all be assessed by parent self-report |
| Comparison of the Proportion of Participants Who Experience a Clinically Significant Decrease in Peak Flow Measurement From Baseline During the 14 Days After LAIV4 or IIV4 | Baseline, Day 15 | For purposes of this measure, a clinically significant decrease in peak flow is defined as: a decrease of ≥20% in PEFR from baseline PEFR |
Countries
United States
Participant flow
Participants by arm
| Arm | Count |
|---|---|
| Live Attenuated Influenza Vaccine (LAIV4) Participants will receive one dose of quadrivalent live attenuated influenza vaccine via intranasal spray (administer approximately one half of the contents of the single-dose intranasal sprayer into each nostril, each sprayer contains 0.2 mL of vaccine)).
Quadrivalent Live Attenuated Influenza Vaccine (LAIV4): 1 dose, 0.2 mL, intranasal administration | 79 |
| Inactivated Influenza Vaccine (IIV4) Participants will receive one dose of quadrivalent inactivated influenza vaccine via intramuscular injection (0.5 mL).
Quadrivalent Inactivated Influenza Vaccine (IIV4): 1 dose, 0.5 mL, intramuscular administration | 72 |
| Total | 151 |
Withdrawals & dropouts
| Period | Reason | FG000 | FG001 |
|---|---|---|---|
| Overall Study | Lost to Follow-up | 5 | 4 |
| Overall Study | Not eligible | 0 | 1 |
Baseline characteristics
| Characteristic | Live Attenuated Influenza Vaccine (LAIV4) | Inactivated Influenza Vaccine (IIV4) | Total |
|---|---|---|---|
| Age, Continuous | 9.00 years | 9.00 years | 9.00 years |
| Age, Customized Age Group 12-17 years old | 21 Participants | 17 Participants | 38 Participants |
| Age, Customized Age Group 5-11 years old | 58 Participants | 55 Participants | 113 Participants |
| Asthma Severity Status Mild | 26 Participants | 19 Participants | 45 Participants |
| Asthma Severity Status Moderate or Severe | 53 Participants | 53 Participants | 106 Participants |
| BMI | 19.50 kg/m2 | 18.60 kg/m2 | 18.75 kg/m2 |
| Ethnicity (NIH/OMB) Hispanic or Latino | 4 Participants | 3 Participants | 7 Participants |
| Ethnicity (NIH/OMB) Not Hispanic or Latino | 75 Participants | 69 Participants | 144 Participants |
| Ethnicity (NIH/OMB) Unknown or Not Reported | 0 Participants | 0 Participants | 0 Participants |
| Height | 53.90 inches | 53.70 inches | 53.75 inches |
| History of nasal or sinus allergies No | 19 Participants | 27 Participants | 46 Participants |
| History of nasal or sinus allergies Unknown | 4 Participants | 0 Participants | 4 Participants |
| History of nasal or sinus allergies Yes | 56 Participants | 45 Participants | 101 Participants |
| Influenza Season 2018-2019 | 27 Participants | 25 Participants | 52 Participants |
| Influenza Season 2019-2020 | 52 Participants | 47 Participants | 99 Participants |
| Race/Ethnicity, Customized Race recoded Black | 25 Participants | 24 Participants | 49 Participants |
| Race/Ethnicity, Customized Race recoded Other | 11 Participants | 6 Participants | 17 Participants |
| Race/Ethnicity, Customized Race recoded White | 43 Participants | 42 Participants | 85 Participants |
| Race (NIH/OMB) American Indian or Alaska Native | 0 Participants | 0 Participants | 0 Participants |
| Race (NIH/OMB) Asian | 2 Participants | 0 Participants | 2 Participants |
| Race (NIH/OMB) Black or African American | 25 Participants | 24 Participants | 49 Participants |
| Race (NIH/OMB) More than one race | 9 Participants | 6 Participants | 15 Participants |
| Race (NIH/OMB) Native Hawaiian or Other Pacific Islander | 0 Participants | 0 Participants | 0 Participants |
| Race (NIH/OMB) Unknown or Not Reported | 0 Participants | 0 Participants | 0 Participants |
| Race (NIH/OMB) White | 43 Participants | 42 Participants | 85 Participants |
| Received seasonal influenza vaccine in the past 12 months No | 42 Participants | 43 Participants | 85 Participants |
| Received seasonal influenza vaccine in the past 12 months Unknown | 7 Participants | 3 Participants | 10 Participants |
| Received seasonal influenza vaccine in the past 12 months Yes | 30 Participants | 26 Participants | 56 Participants |
| Sex: Female, Male Female | 35 Participants | 28 Participants | 63 Participants |
| Sex: Female, Male Male | 44 Participants | 44 Participants | 88 Participants |
| Site Cincinnati | 54 Participants | 53 Participants | 107 Participants |
| Site Duke | 13 Participants | 11 Participants | 24 Participants |
| Site Vanderbilt | 12 Participants | 8 Participants | 20 Participants |
| Weight in kg | 39.1 kilograms | 35.0 kilograms | 38.3 kilograms |
Adverse events
| Event type | EG000 affected / at risk | EG001 affected / at risk |
|---|---|---|
| deaths Total, all-cause mortality | 0 / 74 | 0 / 68 |
| other Total, other adverse events | 8 / 74 | 10 / 68 |
| serious Total, serious adverse events | 0 / 74 | 0 / 68 |
Outcome results
Primary
Comparison of the Proportion of Participants Experiencing an Asthma Exacerbation During the 42 Days After LAIV4 vs. IIV4 (Until Day 43).
For this study, asthma exacerbation will be defined as: any acute episode of progressively worsening shortness of breath (dyspnea), cough, wheezing, chest tightness, and/or respiratory distress during the 42 days (until day 43) after influenza vaccination for which the patient seeks unscheduled medical attention (e.g., healthcare provider office or Emergency Department visit or hospitalization) or receives a new prescription for systemic corticosteroids.
Time frame: Day 43
| Arm | Measure | Category | Value (COUNT_OF_PARTICIPANTS) |
|---|---|---|---|
| Live Attenuated Influenza Vaccine (LAIV4) | Comparison of the Proportion of Participants Experiencing an Asthma Exacerbation During the 42 Days After LAIV4 vs. IIV4 (Until Day 43). | Asthma exacerbation within 43 days | 8 Participants |
| Live Attenuated Influenza Vaccine (LAIV4) | Comparison of the Proportion of Participants Experiencing an Asthma Exacerbation During the 42 Days After LAIV4 vs. IIV4 (Until Day 43). | No asthma exacerbation within 43 days | 66 Participants |
| Inactivated Influenza Vaccine (IIV4) | Comparison of the Proportion of Participants Experiencing an Asthma Exacerbation During the 42 Days After LAIV4 vs. IIV4 (Until Day 43). | Asthma exacerbation within 43 days | 10 Participants |
| Inactivated Influenza Vaccine (IIV4) | Comparison of the Proportion of Participants Experiencing an Asthma Exacerbation During the 42 Days After LAIV4 vs. IIV4 (Until Day 43). | No asthma exacerbation within 43 days | 58 Participants |
Secondary
Comparison of the Proportion of Participants Experiencing an Asthma Exacerbation During the 14 Days After LAIV4 vs. IIV4
For this study, asthma exacerbation will be defined as: any acute episode of progressively worsening shortness of breath (dyspnea), cough, wheezing, chest tightness, and/or respiratory distress during the 14 days (until day 15) after influenza vaccination for which the patient seeks unscheduled medical attention (e.g., healthcare provider office or Emergency Department visit or hospitalization) or receives a new prescription for systemic corticosteroids.
Time frame: Day 15
| Arm | Measure | Category | Value (COUNT_OF_PARTICIPANTS) |
|---|---|---|---|
| Live Attenuated Influenza Vaccine (LAIV4) | Comparison of the Proportion of Participants Experiencing an Asthma Exacerbation During the 14 Days After LAIV4 vs. IIV4 | Asthma exacerbation within 14 days | 3 Participants |
| Live Attenuated Influenza Vaccine (LAIV4) | Comparison of the Proportion of Participants Experiencing an Asthma Exacerbation During the 14 Days After LAIV4 vs. IIV4 | No asthma exacerbation within 14 days | 73 Participants |
| Inactivated Influenza Vaccine (IIV4) | Comparison of the Proportion of Participants Experiencing an Asthma Exacerbation During the 14 Days After LAIV4 vs. IIV4 | Asthma exacerbation within 14 days | 4 Participants |
| Inactivated Influenza Vaccine (IIV4) | Comparison of the Proportion of Participants Experiencing an Asthma Exacerbation During the 14 Days After LAIV4 vs. IIV4 | No asthma exacerbation within 14 days | 66 Participants |
Secondary
Comparison of the Proportion of Participants Who Experience a Clinically Significant Decrease in Peak Flow Measurement From Baseline During the 14 Days After LAIV4 or IIV4
For purposes of this measure, a clinically significant decrease in peak flow is defined as: a decrease of ≥20% in PEFR from baseline PEFR
Time frame: Baseline, Day 15
| Arm | Measure | Category | Value (COUNT_OF_PARTICIPANTS) |
|---|---|---|---|
| Live Attenuated Influenza Vaccine (LAIV4) | Comparison of the Proportion of Participants Who Experience a Clinically Significant Decrease in Peak Flow Measurement From Baseline During the 14 Days After LAIV4 or IIV4 | No PEFR decrease >= 20% from baseline within 14 days | 36 Participants |
| Live Attenuated Influenza Vaccine (LAIV4) | Comparison of the Proportion of Participants Who Experience a Clinically Significant Decrease in Peak Flow Measurement From Baseline During the 14 Days After LAIV4 or IIV4 | PEFR decreased >= 20% from baseline within 14 days | 39 Participants |
| Live Attenuated Influenza Vaccine (LAIV4) | Comparison of the Proportion of Participants Who Experience a Clinically Significant Decrease in Peak Flow Measurement From Baseline During the 14 Days After LAIV4 or IIV4 | Unknown | 1 Participants |
| Inactivated Influenza Vaccine (IIV4) | Comparison of the Proportion of Participants Who Experience a Clinically Significant Decrease in Peak Flow Measurement From Baseline During the 14 Days After LAIV4 or IIV4 | No PEFR decrease >= 20% from baseline within 14 days | 37 Participants |
| Inactivated Influenza Vaccine (IIV4) | Comparison of the Proportion of Participants Who Experience a Clinically Significant Decrease in Peak Flow Measurement From Baseline During the 14 Days After LAIV4 or IIV4 | PEFR decreased >= 20% from baseline within 14 days | 33 Participants |
| Inactivated Influenza Vaccine (IIV4) | Comparison of the Proportion of Participants Who Experience a Clinically Significant Decrease in Peak Flow Measurement From Baseline During the 14 Days After LAIV4 or IIV4 | Unknown | 0 Participants |
Secondary
Comparison of the Proportion of Participants With Asthma Symptoms and Unscheduled Albuterol Use During the 14 Days After Receipt of LAIV4 or IIV4 (Each is Assessed Separately).
Cough, wheezing, tightness in chest, nighttime awakening and unscheduled albuterol use will all be assessed by parent self-report
Time frame: Day 15
| Arm | Measure | Group | Category | Value (COUNT_OF_PARTICIPANTS) |
|---|---|---|---|---|
| Live Attenuated Influenza Vaccine (LAIV4) | Comparison of the Proportion of Participants With Asthma Symptoms and Unscheduled Albuterol Use During the 14 Days After Receipt of LAIV4 or IIV4 (Each is Assessed Separately). | Asthma symptoms within 14 days | No | 18 Participants |
| Live Attenuated Influenza Vaccine (LAIV4) | Comparison of the Proportion of Participants With Asthma Symptoms and Unscheduled Albuterol Use During the 14 Days After Receipt of LAIV4 or IIV4 (Each is Assessed Separately). | Asthma symptoms within 14 days | Yes | 58 Participants |
| Live Attenuated Influenza Vaccine (LAIV4) | Comparison of the Proportion of Participants With Asthma Symptoms and Unscheduled Albuterol Use During the 14 Days After Receipt of LAIV4 or IIV4 (Each is Assessed Separately). | Night-time awakening within 14 days | No | 55 Participants |
| Live Attenuated Influenza Vaccine (LAIV4) | Comparison of the Proportion of Participants With Asthma Symptoms and Unscheduled Albuterol Use During the 14 Days After Receipt of LAIV4 or IIV4 (Each is Assessed Separately). | Night-time awakening within 14 days | Yes | 21 Participants |
| Live Attenuated Influenza Vaccine (LAIV4) | Comparison of the Proportion of Participants With Asthma Symptoms and Unscheduled Albuterol Use During the 14 Days After Receipt of LAIV4 or IIV4 (Each is Assessed Separately). | Unscheduled Albuterol use within 14 days | No | 41 Participants |
| Live Attenuated Influenza Vaccine (LAIV4) | Comparison of the Proportion of Participants With Asthma Symptoms and Unscheduled Albuterol Use During the 14 Days After Receipt of LAIV4 or IIV4 (Each is Assessed Separately). | Unscheduled Albuterol use within 14 days | Yes | 35 Participants |
| Inactivated Influenza Vaccine (IIV4) | Comparison of the Proportion of Participants With Asthma Symptoms and Unscheduled Albuterol Use During the 14 Days After Receipt of LAIV4 or IIV4 (Each is Assessed Separately). | Unscheduled Albuterol use within 14 days | No | 44 Participants |
| Inactivated Influenza Vaccine (IIV4) | Comparison of the Proportion of Participants With Asthma Symptoms and Unscheduled Albuterol Use During the 14 Days After Receipt of LAIV4 or IIV4 (Each is Assessed Separately). | Asthma symptoms within 14 days | No | 20 Participants |
| Inactivated Influenza Vaccine (IIV4) | Comparison of the Proportion of Participants With Asthma Symptoms and Unscheduled Albuterol Use During the 14 Days After Receipt of LAIV4 or IIV4 (Each is Assessed Separately). | Night-time awakening within 14 days | Yes | 28 Participants |
| Inactivated Influenza Vaccine (IIV4) | Comparison of the Proportion of Participants With Asthma Symptoms and Unscheduled Albuterol Use During the 14 Days After Receipt of LAIV4 or IIV4 (Each is Assessed Separately). | Asthma symptoms within 14 days | Yes | 50 Participants |
| Inactivated Influenza Vaccine (IIV4) | Comparison of the Proportion of Participants With Asthma Symptoms and Unscheduled Albuterol Use During the 14 Days After Receipt of LAIV4 or IIV4 (Each is Assessed Separately). | Unscheduled Albuterol use within 14 days | Yes | 26 Participants |
| Inactivated Influenza Vaccine (IIV4) | Comparison of the Proportion of Participants With Asthma Symptoms and Unscheduled Albuterol Use During the 14 Days After Receipt of LAIV4 or IIV4 (Each is Assessed Separately). | Night-time awakening within 14 days | No | 42 Participants |
Secondary
Comparison of the Proportion of Participants With Asthma Symptoms and Unscheduled Albuterol Use During the 14 Days After Receipt of LAIV4 or IIV4 (Each is Assessed Separately).
Cough, wheezing, tightness in chest, nighttime awakening and unscheduled albuterol use will all be assessed by parent self-report
Time frame: Day 15
| Arm | Measure | Group | Category | Value (COUNT_OF_PARTICIPANTS) |
|---|---|---|---|---|
| Live Attenuated Influenza Vaccine (LAIV4) | Comparison of the Proportion of Participants With Asthma Symptoms and Unscheduled Albuterol Use During the 14 Days After Receipt of LAIV4 or IIV4 (Each is Assessed Separately). | Asthma related cough within 14 days | None | 26 Participants |
| Live Attenuated Influenza Vaccine (LAIV4) | Comparison of the Proportion of Participants With Asthma Symptoms and Unscheduled Albuterol Use During the 14 Days After Receipt of LAIV4 or IIV4 (Each is Assessed Separately). | Asthma related cough within 14 days | Mild | 35 Participants |
| Live Attenuated Influenza Vaccine (LAIV4) | Comparison of the Proportion of Participants With Asthma Symptoms and Unscheduled Albuterol Use During the 14 Days After Receipt of LAIV4 or IIV4 (Each is Assessed Separately). | Asthma related cough within 14 days | Moderate | 14 Participants |
| Live Attenuated Influenza Vaccine (LAIV4) | Comparison of the Proportion of Participants With Asthma Symptoms and Unscheduled Albuterol Use During the 14 Days After Receipt of LAIV4 or IIV4 (Each is Assessed Separately). | Asthma related cough within 14 days | Severe | 1 Participants |
| Live Attenuated Influenza Vaccine (LAIV4) | Comparison of the Proportion of Participants With Asthma Symptoms and Unscheduled Albuterol Use During the 14 Days After Receipt of LAIV4 or IIV4 (Each is Assessed Separately). | Asthma related wheezing within 14 days | None | 51 Participants |
| Live Attenuated Influenza Vaccine (LAIV4) | Comparison of the Proportion of Participants With Asthma Symptoms and Unscheduled Albuterol Use During the 14 Days After Receipt of LAIV4 or IIV4 (Each is Assessed Separately). | Asthma related wheezing within 14 days | Mild | 19 Participants |
| Live Attenuated Influenza Vaccine (LAIV4) | Comparison of the Proportion of Participants With Asthma Symptoms and Unscheduled Albuterol Use During the 14 Days After Receipt of LAIV4 or IIV4 (Each is Assessed Separately). | Asthma related wheezing within 14 days | Moderate | 5 Participants |
| Live Attenuated Influenza Vaccine (LAIV4) | Comparison of the Proportion of Participants With Asthma Symptoms and Unscheduled Albuterol Use During the 14 Days After Receipt of LAIV4 or IIV4 (Each is Assessed Separately). | Asthma related wheezing within 14 days | Severe | 1 Participants |
| Live Attenuated Influenza Vaccine (LAIV4) | Comparison of the Proportion of Participants With Asthma Symptoms and Unscheduled Albuterol Use During the 14 Days After Receipt of LAIV4 or IIV4 (Each is Assessed Separately). | Asthma related chest tightness within 14 days | None | 58 Participants |
| Live Attenuated Influenza Vaccine (LAIV4) | Comparison of the Proportion of Participants With Asthma Symptoms and Unscheduled Albuterol Use During the 14 Days After Receipt of LAIV4 or IIV4 (Each is Assessed Separately). | Asthma related chest tightness within 14 days | Mild | 12 Participants |
| Live Attenuated Influenza Vaccine (LAIV4) | Comparison of the Proportion of Participants With Asthma Symptoms and Unscheduled Albuterol Use During the 14 Days After Receipt of LAIV4 or IIV4 (Each is Assessed Separately). | Asthma related chest tightness within 14 days | Moderate | 5 Participants |
| Live Attenuated Influenza Vaccine (LAIV4) | Comparison of the Proportion of Participants With Asthma Symptoms and Unscheduled Albuterol Use During the 14 Days After Receipt of LAIV4 or IIV4 (Each is Assessed Separately). | Asthma related chest tightness within 14 days | Severe | 1 Participants |
| Inactivated Influenza Vaccine (IIV4) | Comparison of the Proportion of Participants With Asthma Symptoms and Unscheduled Albuterol Use During the 14 Days After Receipt of LAIV4 or IIV4 (Each is Assessed Separately). | Asthma related chest tightness within 14 days | Moderate | 3 Participants |
| Inactivated Influenza Vaccine (IIV4) | Comparison of the Proportion of Participants With Asthma Symptoms and Unscheduled Albuterol Use During the 14 Days After Receipt of LAIV4 or IIV4 (Each is Assessed Separately). | Asthma related cough within 14 days | None | 22 Participants |
| Inactivated Influenza Vaccine (IIV4) | Comparison of the Proportion of Participants With Asthma Symptoms and Unscheduled Albuterol Use During the 14 Days After Receipt of LAIV4 or IIV4 (Each is Assessed Separately). | Asthma related wheezing within 14 days | Moderate | 12 Participants |
| Inactivated Influenza Vaccine (IIV4) | Comparison of the Proportion of Participants With Asthma Symptoms and Unscheduled Albuterol Use During the 14 Days After Receipt of LAIV4 or IIV4 (Each is Assessed Separately). | Asthma related cough within 14 days | Mild | 29 Participants |
| Inactivated Influenza Vaccine (IIV4) | Comparison of the Proportion of Participants With Asthma Symptoms and Unscheduled Albuterol Use During the 14 Days After Receipt of LAIV4 or IIV4 (Each is Assessed Separately). | Asthma related chest tightness within 14 days | Mild | 21 Participants |
| Inactivated Influenza Vaccine (IIV4) | Comparison of the Proportion of Participants With Asthma Symptoms and Unscheduled Albuterol Use During the 14 Days After Receipt of LAIV4 or IIV4 (Each is Assessed Separately). | Asthma related cough within 14 days | Moderate | 15 Participants |
| Inactivated Influenza Vaccine (IIV4) | Comparison of the Proportion of Participants With Asthma Symptoms and Unscheduled Albuterol Use During the 14 Days After Receipt of LAIV4 or IIV4 (Each is Assessed Separately). | Asthma related wheezing within 14 days | Severe | 1 Participants |
| Inactivated Influenza Vaccine (IIV4) | Comparison of the Proportion of Participants With Asthma Symptoms and Unscheduled Albuterol Use During the 14 Days After Receipt of LAIV4 or IIV4 (Each is Assessed Separately). | Asthma related cough within 14 days | Severe | 4 Participants |
| Inactivated Influenza Vaccine (IIV4) | Comparison of the Proportion of Participants With Asthma Symptoms and Unscheduled Albuterol Use During the 14 Days After Receipt of LAIV4 or IIV4 (Each is Assessed Separately). | Asthma related chest tightness within 14 days | Severe | 1 Participants |
| Inactivated Influenza Vaccine (IIV4) | Comparison of the Proportion of Participants With Asthma Symptoms and Unscheduled Albuterol Use During the 14 Days After Receipt of LAIV4 or IIV4 (Each is Assessed Separately). | Asthma related wheezing within 14 days | None | 39 Participants |
| Inactivated Influenza Vaccine (IIV4) | Comparison of the Proportion of Participants With Asthma Symptoms and Unscheduled Albuterol Use During the 14 Days After Receipt of LAIV4 or IIV4 (Each is Assessed Separately). | Asthma related chest tightness within 14 days | None | 45 Participants |
| Inactivated Influenza Vaccine (IIV4) | Comparison of the Proportion of Participants With Asthma Symptoms and Unscheduled Albuterol Use During the 14 Days After Receipt of LAIV4 or IIV4 (Each is Assessed Separately). | Asthma related wheezing within 14 days | Mild | 18 Participants |