"Thus vaccination does not account for the impressive declines in mortality seen in the first half of the century." "Once again, nearly 90% of the decline in infectious disease mortality among US children occurred before 1940, when few antibiotics or vaccines were available." -- Study in Pediatrics, the journal of the American Academy of Pediatrics. Here's a pdf copy of the study: https://vaccinesafetycommission.org/pdfs/45-2000-Pediatrics-Vital-Statistics.pdf