This study is about understanding how our immune system reacts to the flu virus, specifically a type called H3N2. The researchers want to see how the virus spreads and whether it's safe to expose healthy people to this virus in a controlled setting. By doing this, they can learn more about the flu and how to make better vaccines. Participants will get the flu virus either through a nose spray or by being around others with the virus. They'll stay in the hospital for 8 to 12 days for observation and then have follow-up visits at a clinic. The study lasts for 5 months.
- Participants will stay in the hospital for 8-12 days.
- The study involvement lasts 5 months.
- The study is for healthy people aged 18-49.
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