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| 1942 || Disinfection method introduction || || Weeden Underwood defines the first "flash sterilization" at 30 min at 121°C.<ref name="Rogers"/> || {{w|United States}}
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| 1943 || Prevention Social distancing || || An early {{w|isolation ward}} in the United States is established.<ref>{{cite book |title=Navy Medicine, Volume 95, Issue 1 |url=https://books.google.com.ar/books?id=WtC6VUZ8XGgC&pg=PA32&lpg=PA32&dq=1943+First+isolation+ward+in+USA&source=bl&ots=jOy4TdbghP&sig=ACfU3U05uJpuL3bjg3fImCTZPdQE3g54yg&hl=en&sa=X&ved=2ahUKEwit-PiyxMbpAhXoIbkGHT-uCEUQ6AEwAHoECAgQAQ#v=onepage&q=1943%20First%20isolation%20ward%20in%20USA&f=false}}</ref> || {{w|United States}}
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| 1943 || Disinfectant research || Bacterial infection || Theodore Puck, Robertson and Henry Lemon report on the bactericidal activity of {{w|propylene glycol}} (hydrolysis by-product of propylene oxide) vapour.<ref name="Rogers"/> ||
