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Home Q & A Board Biology-Related Homework Help General Biology
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tyressjones tyressjones
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7 years ago
Why are new flu shots necessary every year?
A) The flu is caused by either bacteria or viruses, depending on the year.
B) The shots do not result in the production of memory cells.
C) Flu viruses mutate rapidly.
D) The antiviral chemicals in flu shots last only 11 months.
Textbook 
Biology: Life on Earth

Biology: Life on Earth


Edition: 10th
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kont24kont24
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7 years ago
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