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Humans are covered with bacteria on all surfaces exposed to the environment around us our skin, respiratory, and digestive tracks. Roughly 2,000 organisms occupy each square centimeter of these surfaces (roughly 15,000 organisms per square inch). We shed our outer skin layer each http://sand.net76.net two weeks. The skin cells and the oils and other chemical in and on them as well the bacteria hitch-hiking a ride on them end up on the floor, furniture, and even the walls and windows.
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