Study Summary: This study is testing a new drug called **CD388** to see if it can prevent flu in healthy adults aged 18 to 64. Participants will receive **CD388** or a **placebo** (a harmless substance that looks like the drug) through **3 subcutaneous (SQ)** injections, which means the drug is injected under the skin. The study will check if **CD388** is safe, easy to tolerate, and effective compared to the **placebo**.
Key Points:
- **Duration**: Participants will be in the study from the day they start until 32 weeks after getting the drug.
- **Visits**: Participants need to attend scheduled visits and complete surveys on a smartphone, tablet, or computer.
- **Requirements**: Participants must use birth control (if applicable) and avoid donating blood, eggs, sperm, or participating in other studies during the study period.
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