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Jennifer Girotto, Clinical Professor of Pharmacy Practice, University of Connecticut

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

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

Given recent headlines, you may be wondering why polio is even an issue in 2022. For more than 60 years, vaccines against the poliovirus have protected virtually everyone in the United States from the disease. Due to an enormously successful polio vaccination campaign beginning in the 1950s when the first polio vaccines became available, by 1979 polio was considered eliminated in the U.S.

Unfortunately, even today, there are communities in the U.S. that have lower-than-necessary polio vaccination rates. Because many people have not been vaccinated, there is now a real possibility of a resurgence of polio in the U.S.

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