Jennifer Girotto

In 1956, during the height of the polio epidemic in the U.S., health officials in Chicago offer polio shots at a public school. Bettmann via Getty Images

Polio vaccination rates in some areas of the US hover dangerously close to the threshold required for herd immunity – here’s why that matters

With poliovirus circulating in New York, health authorities worry that pockets of the county with low polio vaccination rates could give the virus a foothold.

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