How The Oral Polio Vaccine Can Cause Polio

One of the vaccines used to prevent polio has actually been causing some people to get the disease.

Just last month, the World Health Organization announced that two of three strains of polio had been eradicated. It’s been one of the great success stories of modern medicine. The disease, which, of course, can lead to paralysis, has been reduced to just a handful of cases around the world. But now scientists say there’s been a troubling

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