The purpose of this study is to assess the safety and effectiveness (immune response) to a licensed H1N12009 influenza vaccine in adults when given at the same time or prior to the seasonal influenza vaccine. The study will enroll 300 adults (ages 20-59 years). Participants will be randomized into 2 groups. One group will receive one dose of a licensed H1N1 vaccine and one dose of the seasonal influenza vaccine at the same time; the second group will receive the seasonal influenza vaccine 3 weeks after receiving the licensed H1N12009 influenza vaccine. Study procedures include: medical history, blood samples and completing a memory aid. Participants will be involved in study related procedures for approximately 3-6 weeks depending upon the group assignment.
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AI-rewrites the medical criteria so a patient or caregiver can understand them. Always confirm with the trial site.
Occurrence of adverse events (AEs) for days 0-6 after each vaccination
Timeframe: Day 7 and Day 21 post vaccination
Occurrence of serious adverse events (SAEs) and other significant health events up to 21 days after each vaccination
Timeframe: Day 7 and Day 21 post vaccination