The bactericidal efficiency of an acidic quaternary ammonium compound (QAC) was examined over a temperature range of 20–55 C. The efficiency increased from no detectable kill in 1 min at 20 C to a 5-decimal reduction in 1 min at 55 C. It is recommended that temperature be taken into account when assessing the efficiency of disinfectants.

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Author notes

1“Mycosan” product of Ivon Watkins Dow, New Plymouth, New Zealand.