Polio vaccine is now given in a two-step process, first inactivated poliovirus and then live oral polio vaccine. Why is such a two-step process used?
A. It allows health professionals to promise that children cannot get polio from the immunization process.
B. Live oral polio vaccine for the second dose is cheaper than giving both doses with inactivated poliovirus
C. It is more risky for employees to grow and prepare live polio vaccine than inactivated poliovirus.
D. Some newly immunized individuals caught polio from the live vaccine when only live vaccine was given.
ANS: D
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