Reported cases of paralytic polio from vaccine-derived viruses, World

Some cases of paralytic polio arise from vaccine-derived strains that have reverted into a form that can causedisease. There are three vaccine-derived strains of paralytic polio: VDPV1, 2, and 3. This shows cases of circulatingVDPVs.

20162023201720182019202020212022500VDPV1 cases

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Reported cases of paralytic polio from vaccine-derived viruses

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