During the global switch from OPV, which serotype component was removed?

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Study for the Poliovirus and Poliomyelitis Test. Prepare with engaging flashcards and detailed multiple-choice questions, each with hints and explanations. Ace your exam with confidence!

Multiple Choice

During the global switch from OPV, which serotype component was removed?

Explanation:
The change removed the Type 2 component from OPV. The trivalent oral polio vaccine, used before the switch, protected against all three serotypes. After the switch, the vaccine became bivalent and focused on types 1 and 3 because wild poliovirus type 2 had been eradicated and the Type 2 component carried a risk of vaccine-derived outbreaks. Removing it reduced those risks, while immunity to Type 2 was maintained by using the inactivated polio vaccine (IPV) rather than live vaccine. The other serotypes stayed in the vaccine because they were still circulating and needed continued protection.

The change removed the Type 2 component from OPV. The trivalent oral polio vaccine, used before the switch, protected against all three serotypes. After the switch, the vaccine became bivalent and focused on types 1 and 3 because wild poliovirus type 2 had been eradicated and the Type 2 component carried a risk of vaccine-derived outbreaks. Removing it reduced those risks, while immunity to Type 2 was maintained by using the inactivated polio vaccine (IPV) rather than live vaccine. The other serotypes stayed in the vaccine because they were still circulating and needed continued protection.

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