Flu shot mystery: why some seniors keep antibodies longer

NCT ID NCT02401893

First seen Jun 11, 2026 ยท Last updated Jun 11, 2026

Summary

This study looked at why some older adults (age 50 and up) maintain flu-fighting antibodies longer after getting the flu vaccine. Researchers enrolled 510 people and measured their immune response over time. The goal was to understand factors that help maintain protection, not to test a new treatment.

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