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Fewer Cases in Late 30s
In the late thirties, there were fewer cases of polio than in 1956. -
Rise of Cases
There was a rise in the early 1940s, particularly in 1944 when 19,029 cases were reported. -
Drop to 10,000 Polio Cases
A sharp drop to about 10,000 cases in 1947. -
"High Polio Years"
In 1952, there were a number of "high polio years" reaching a peak with 57,879 cases. -
Drop-off of Half the Cases Cases in 1952
Drop-off to about half that number of cases in 1952 in 1955.