Study to Evaluate the Safety of 3 New 6:2 Influenza Virus Reassortants in Adults for the 2015-2016 Season

Phase 4

Completed

Conditions: Healthy
Influenza

Interventions: Other: Placebo
Biological: Trivalent Influenza Vaccine

Registration Number: NCT02473510

Lead Sponsor: MedImmune LLC

Brief Summary: This prospective annual release study is designed to evaluate the safety of 3 new influenza virus vaccine strains to be included in FluMist Quadrivalent for the 2015-2016 influenza season

Detailed Description: This prospective, randomized, double-blind, placebo-controlled release study will enroll approximately 300 healthy adults 18 to 49 years of age. Eligible participants will be randomly assigned in a 4:1 fashion to receive a single dose of trivalent vaccine or placebo by intranasal spray. Randomization will be stratified by site. This study will be conducted at 3 sites in the United States of America. Each participant will receive 1 dose of investigational product on Day 1. The duration of study participation for each participant is the time from study vaccination through 181 days after study vaccination.

Recruitment & Eligibility

Status: COMPLETED

Sex: All

Target Recruitment: 301

Inclusion Criteria

Age 18 through 49 years
Written informed consent
Participant available by telephone
Ability to understand and comply with the requirements of the protocol, as judged by the Investigator

Exclusion Criteria

Concurrent enrollment in another clinical study up to 180 days after receipt of investigational product (Day 181)
History of hypersensitivity to any component of the vaccine, including egg or egg protein or serious, life threatening, or severe reactions to previous influenza vaccinations
Any condition for which the inactivated influenza vaccine is indicated, including chronic disorders of the pulmonary or cardiovascular systems (example [eg], asthma), chronic metabolic diseases (eg, diabetes mellitus), renal dysfunction, or hemoglobinopathies that required regular medical follow-up or hospitalization during the preceding year
Acute febrile (greater than [>] 100.0 degrees Fahrenheit [F] oral or equivalent) and/or clinically significant respiratory illness (example, cough or sore throat) within 14 days prior to randomization
Any known immunosuppressive condition or immune deficiency disease, including human immunodeficiency virus infection, or ongoing immunosuppressive therapy
History of Guillain-Barré syndrome

Study & Design

Study Type: INTERVENTIONAL

Study Design: PARALLEL

Arm && Interventions

Group	Intervention	Description
Placebo	Placebo	A single dose of placebo matched to trivalent influenza vaccine will be administered as intranasal spray on Day 1.
Trivalent Influenza Vaccine	Trivalent Influenza Vaccine	A single dose of 10\^(7.0 +/- 0.5) fluorescent focus units (FFU) per strain of trivalent influenza vaccine will be administered as intranasal spray on Day 1.

Primary Outcome Measures

Name	Time	Method
Percentage of Participants With Fever Greater Than or Equal to (>=) 101 Degrees Fahrenheit (F)	Baseline (Day 1) up to Day 8	Percentage of participants with fever defined as oral temperature \>=101 degrees F were reported.

Secondary Outcome Measures

Name	Time	Method
Number of Participants With Treatment Emergent Adverse Events (TEAEs)	Baseline (Day 1) up to Day 8 and Day 15	An adverse event (AE) is any untoward medical occurrence in a participant who received study drug without regard to possibility of causal relationship. Treatment-emergent AEs were events between administration of study drug and up to 15 days after vaccination that are absent before treatment or that worsened relative to pre-treatment state. Results were given for AEs reported within 8 days and 15 days after vaccination.
Number of Participants With Treatment Emergent Serious Adverse Events (TESAEs) and New Onset Chronic Disease (NOCDs)	Baseline (Day 1) up to Day 29 and 181	An AE is any untoward medical occurrence in a participant who received study drug without regard to possibility of causal relationship. An SAE is an AE resulting in any of the following outcomes or deemed significant for any other reason: death; initial or prolonged inpatient hospitalization; life-threatening experience (immediate risk of dying); persistent or significant disability/incapacity; congenital anomaly. Treatment-emergent SAEs were serious events between administration of study drug and up to 181 days after the dose that are absent before treatment or that worsen relative to pretreatment state. An NOCD is a newly diagnosed medical condition that is of a chronic, ongoing nature and is assessed by the investigator as medically significant. Results were given for TESAEs and NOCDs reported within 29 days and 181 days after vaccination.
Percentage of Participants With Solicited Symptoms	Baseline (Day 1) up to Day 8 and Day 15	Solicited symptoms are predefined symptoms or events specifically inquired about and assessed daily after vaccine administration up to 15 days after vaccination. The solicited symptoms include fever greater than (\>) 100.0 degrees F (37.8 degrees Celsius), runny nose, sore throat, cough, vomiting, muscle aches, chills, decreased activity and headache. Results were reported for all solicited symptoms except fever \>=101 degrees F (reported as primary outcome) within 8 days after vaccination and all solicited symptoms within 15 days after vaccination.
Percentage of Participants Who Require Antipyretic and/or Analgesic Medication	Baseline (Day 1) up to Day 8 and Day 15	Percentage of participants who require antipyretic and/or analgesic medication were reported.