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any virus or disease could enter your body by any exchange of fluids, that includes any scraps or cuts on your body.. so if you have broken skin anywhere on your body that is an entrance way into your body....if you have to work on a sewer or drain it would be in your best interest to pour some bleach down the drain and let it mix with any waste water to try and kill off any nasties....
again this is just a guess and common sense approach..will it work?? who knows but something is better than nothing...