Polio incidence began its sharp plummet in 1952. This is 3 years before the vaccine was licensed by HEW in 1955. Thus, the Salk polio vaccination did not significantly correlate with declining polio incidence. However, a significant correlation with declining polio incidence is found with reports in 1952 that nursing cow calves were dying with of symptoms and physiology when their mother's were fed fodder that had been treated with DDT.
The plummet also correlates with the 1951 government/industry debate over pesticide safety.
The plummet also correlates with the phase-out of persistent pesticides production in the early 1950s. ("Persistent" pesticides are those which do not easily biodegrade, such as DDT, BHC, arsenic compounds, and lead compounds.)
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# posted by madthumbs @ 11:29 PM
