How Lagging Vaccination Could Lead to a Polio ResurgenceIn its original form, the virus survives in just two countries. But a type linked to an oral vaccine used in other nations has already turned up in the West.

In its original form, the virus survives in just two countries. But a type linked to an oral vaccine used in other nations has already turned up in the West.In its original form, the virus survives in just two countries. But a type linked to an oral vaccine used in other nations has already turned up in the West.

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How Lagging Vaccination Could Lead to a Polio ResurgenceIn its original form, the virus survives in just two countries. But a type linked to an oral vaccine used in other nations has already turned up in the West.

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