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Office coffee mugs
"Colonies of germs are living in your favorite cup. Twenty percent of office mugs carry fecal bacteria, and 90 percent are covered in other germs," Professor Charles P. Gerba of the University of Arizona, told Men's Health magazine. "That's because in an office, most people tend to clean their cups with bacteria-laden sponges or scrub brushes instead of in a dishwasher. That bacteria transfers to the mug and can live there for three days."
