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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.
B. The virus mutates much more rapidly.
Expert answered|chopsuey|Points 21|
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Asked 10/23/2012 8:04:53 AM
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