Which type of vaccine may revert to a virulent form of the organism?
A) Cholera vaccine
B) Pertussis vaccine
C) Salk polio vaccine
D) Influenza vaccine (subcutaneous version)

Question

Quizplus · Accepted Answer

From the list, only the cholera vaccine is a live, attenuated vaccine, which may revert to a more virulent form even though modifications were made to eliminate virulence factors.

Which Type of Vaccine May Revert to a Virulent Form