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![Key Facts About Seasonal Flu Vaccine | Seasonal Influenza (Flu ...](https://www.iarticlesnet.com/pub/img/site/s_38.jpeg)
Key Facts About Seasonal Flu Vaccine | Seasonal Influenza (Flu ...
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日期:2024-09-06
Flu viruses are constantly changing (called “antigenic drift”) – they can change
from one season to the next or they can even change within the course of one flu
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