Polio virus cases:

1 case in Pakistan of the wild type polio virus.

3 cases in Nigeria of cVDP2

1 case in Indonesia of cVDP2

Circulating vaccine-derived poliovirus type 2 happens when polio cases are extremely low and the country uses a live poliovirus vaccine, the oral polio virus (OPV). At times, but rarely, the live poliovirus vaccine mutates causing to become virulent. The US stopped using the oral polio vaccine for this reason, switching exclusively to the inactivated poliovirus vaccine (IPV) in 2000. IPV is excellent at providing immunity, but OPV is better at preventing infection and transmission. OPV is easy to administer, inexpensive, and doesn't require sterile needles or a complex cold chain system.

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