Peter A. McCullough, MD, MPH® @P_McCulloughMD · 02 Sep 2026
Water sanitation, better nutrition, and improved personal hygiene reduced fecal-oral spread of polio during the 1950's and 1960's. By late 1970 the US had nearly universal water quality standards. The Salk Field trials found that IPV was only 60-70% effective. Polio https://t.co/bUumAySYIu
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