The attenuated oral poliovirus vaccine,(OVP), is no longer administered in the U.S.A. because it
A) is very toxic.
B) does not provide good immunity.
C) can revert to wild-type virulence.
D) can be spread to contacts.
E) can be spread to contacts and can revert to wild-type virulence.

Question

Quizplus · Accepted Answer

The attenuated oral poliovirus vaccine can be spread to contacts and can revert to wild-type virulence. This means that the vaccine strain can mutate and potentially cause paralysis, similar to the wild-type virus. Therefore, in the U.S.A., the inactivated poliovirus vaccine is used instead, which is safer and more effective at providing immunity.

The Attenuated Oral Poliovirus Vaccine,(OVP), Is No Longer Administered in the U.S.A