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Polio was completely gone from the U.S. for 10 years before it was found last month. Now a vaccine-derived strain is in London and it’s “beyond a close network of a few individuals.” Read More
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Polio was completely gone from the U.S. for 10 years before it was found last month. Now a vaccine-derived strain is in London and it’s “beyond a close network of a few individuals.” Read More
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Source link