What is the purpose of introducing IPV alongside bOPV in the immunization schedule?

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Multiple Choice

What is the purpose of introducing IPV alongside bOPV in the immunization schedule?

When a live vaccine that included one poliovirus type is removed from use, immunity against that type must still be maintained by another vaccine. The bivalent oral polio vaccine covers types 1 and 3, so type 2 is no longer addressed by OPV. Introducing the inactivated polio vaccine provides systemic immunity to type 2 without the risks associated with live vaccines. This protects individuals from paralytic disease if they encounter type 2 poliovirus and helps prevent outbreaks, including vaccine-derived ones, by ensuring antibodies against type 2 are present. It does not replace OPV; it complements it to maintain protection against all three poliovirus serotypes.

When a live vaccine that included one poliovirus type is removed from use, immunity against that type must still be maintained by another vaccine. The bivalent oral polio vaccine covers types 1 and 3, so type 2 is no longer addressed by OPV. Introducing the inactivated polio vaccine provides systemic immunity to type 2 without the risks associated with live vaccines. This protects individuals from paralytic disease if they encounter type 2 poliovirus and helps prevent outbreaks, including vaccine-derived ones, by ensuring antibodies against type 2 are present. It does not replace OPV; it complements it to maintain protection against all three poliovirus serotypes.

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