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Africa Declares Wild Polio Is Wiped Out — Yet It Persists In Vaccine-Derived Cases

An oral polio vaccine, which contains weakened live virus, is administered in a health enter in Togo. Africa has declared that wild polio has been eradicated, but a relatively small number of cases of vaccine-derived polio persist. (Universal Images Group via Getty)
An oral polio vaccine, which contains weakened live virus, is administered in a health enter in Togo. Africa has declared that wild polio has been eradicated, but a relatively small number of cases of vaccine-derived polio persist. (Universal Images Group via Getty)

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