It turns out that what you’re washing with has a much bigger statistical effect than how long you’re washing for.
In fact, it turns out that what you’re washing with has a much bigger statistical effect than how long you’re washing.
In fact, the log reductions vary widely between trials that use the same time length. There are 30-second hand-washing trials that don’t reduce the microbial load at all … and ones with a reduction greater than 4-log. The best of the 120-second trials doesn’t break 3-log. The 180-second trial barely gets better than a 1-log reduction. The difference probably has to do with other variables like specific soap formulation, the type and amount of microorganisms, and individual technique.
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