Vaccine prevention of acute respiratory infections (the common cold) is unlikely because
A) there is a relatively low social and economic cost associated with the common cold.
B) colds are easily misdiagnosed as something else.
C) antibiotics easily cure the common cold.
D) there are many distinct virus strains and serovars that cause the common cold.
E) humans do not generate a strong immune response to common cold viruses.
Answer: D
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