replying to Joseph Meehan, rmwmd wrote:
Although levels of bacteria and viruses vary over time, the levels are higher
in the bathroom. This is because the bathroom is smaller (keeps bugs
"concentrated") and more sources are exposed in the bathroom (think "exhaust"
fumes). Kitchen poses a risk of skin infections; bathroom increases risk of
gastrointestinal infections. Careful hand washing reduces risk of skin
infection, but it is much more difficult to reduce the GI bugs as many are
airborne, as well as on surfaces.

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