Salk vaccine

Full scale vaccination begins April 12, 1955. The target age group is 6-9 years [Not the age of maximum susceptibility](Scheele, A.S., Shannon, J.A., "Health Implications In A Program Of vaccination Against Poliomyelitis", JAMA, August 6, 1955).

The Cutter Laboratory disaster is discovered 13 days later, April 25, 1955. Documented cases caused by the Cutter vaccine were 79.

Polio incidence began its sharp plummet in 1952. This is 3 years before the 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.)

Dr. Thomas Francis did not mention in his key evaluation of the 1954 Salk field trials that those who contracted polio after their first innoculation and before their second inoculation were placed in the "not-inoculated" list.'

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