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There is a Wikipedia page which gives some typical values for infectious doses of bacteria. I suspect that lot of these have been taken from this slideshow which confirms the values on the Wikipedia page, gives more interesting details of how they have been arrived at, and also mentions a few viruses. It seems from the slideshow that infectious dose isn't ...

Washing your hands is an exercise in probability rather than absolute values. An important thing to keep in mind is that not only is it very hard to kill all the bacteria on your hands, it's also not something you actually want to do. Most of the bacteria we encounter day to day are either benign or beneficial to personal health. We know that gnotobiotic ...