Last edited Wed Mar 19, 2025, 12:07 PM - Edit history (2)
There was very little overlap between the years when polio outbreaks were common and those when DDT was in wide use.
There were major polio outbreaks in the US and other industrialized countries beginning in the late19th century and continuing through the first half of the 20th century. During that time, scientists and physicians were able to become very familiar with the disease, including how to recognize and diagnose it. The polio virus was first isolated in 1908.
DDT didn't come into wide use as an insecticide until 1939, and it wasn't completely banned in the US until 1972. The incidence pf polio, otoh, began to decline dramatically after the introduction of effective vaccines in the lste 1950s and early 1960s. So the numbers just don't add up! 
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