| Front | What is the reason behind their being different flu vaccines every winter? |
|---|---|
| Back | Antigenic drift causes gradual accumulation of mutations of the epitope of the virus that changes the recognizance of the virus by our immune system ↓ Responsible for seasonal fluctuations in influenza virulence and the reason that the efficacy of the annual flu vaccine varies depending on its match to the influenza strain expected to predominant in a given year |
Tags: microbiology
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