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25 September, 16:37

Some diseases require only one vaccination that lasts forever. Others require repeated vaccinations. Why might a vaccination like the flu vaccine only last a short time? A. The virus is more easily transmitted. B. The virus mutates much more rapidly. C. The virus is less dangerous. D. The virus is much smaller.

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  1. 25 September, 16:44
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    The answer is B because the Flu mutates thats why we have to get more flu shots
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