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Reported cases of paralytic polio from vaccine-derived viruses
Some cases of paralytic polio arise from vaccine-derived strains that have reverted into a form that can cause disease. There are three vaccine-derived strains of paralytic polio: VDPV1, 2, and 3. This shows cases of circulating VDPVs.
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Global Polio Eradication Initiative
Attribution: GPEI
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