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| 1933 || {{w|Disinfectant}} || || Soap-solubilized formulation containing chloroxylenol and terpineol is introduced by Colebrook and Maxted.<ref name="Hugo"/> ||
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| 1933 || || || American Engineer Weeden Underwood makes notable advances in design of, and application of pressure steam sterilizers. This is considered the beginning of the era of scientific sterilization.<ref name="Rogers"/> || {{w|United States}}
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| 1934 || || || Weeden Underwood writes an early textbook on sterilization called Textbook on Sterilization.<ref name="Rogers"/> || {{w|United States}}
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| 1935 || {{w|Disinfectant}} || || The use of quaternary ammonium compounds (QACs) as a germicide/disinfectant is formally recognized.<ref name="History and Evolution of Surface Disinfectants"/> ||
