Assertion: contracted polio | /r/HasProperty | over 50,000 cases
Facets:
value: by 1952
type: TEMPORAL
value: in the united states
type: LOCATION
Source sentences:
text: Polio has existed for all of written human history, but there was never a major epidemic of it until 1907 when 2,700 contracted polio in Vermont, by 1952 there were over 50,000 cases in just the United States.