Monday, November 25, 2019

More Polio Cases Now Caused by Vaccine Than by Wild Virus

More Polio Cases Now Caused by Vaccine Than by Wild Virus

By THE ASSOCIATED PRESS from NYT Health https://ift.tt/2XOh1AW

via Blogger https://ift.tt/34m9Faa
November 26, 2019 at 10:19AM
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