OPV, the attenuated oral poliovirus vaccine, is no longer administered in the U.S.A. because it
A) is very toxic.
B) can be spread to contacts.
C) can revert to wild-type virulence.
D) does not provide good immunity.
E) can be spread to contacts and can revert to wild-type virulence.
Correct Answer:
Verified
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A) active
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Q14: Toxoid vaccines are commonly used when
A) immunity
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