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Polio | Definition, Symptoms, Vaccine, & Facts | Britannica
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Polio - Wikipedia
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Neil Davies on X: "Whereas as of July 27th there have been 2 cases of wild polio in 2021, one in each of Afghanistan and Pakistan. https://t.co/v8mnMD6tBd https://t.co/8VS3udiLPr" / X
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Polio - Wikipedia
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Wikipedia's coverage of essential vaccines is expanding – Diff
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