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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.
An emergency polio ward in Boston in 1955 equipped with iron lungs. These pressurized respirators acted as breathing muscles for polio victims, often children, who were paralyzed. www.apimages.com

The deadly polio epidemic and why it matters for coronavirus

Polio was nearly eradicated with the Salk vaccine in 1955. At the time, little was known about this mysterious disease that paralyzed and sometimes killed young children.

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