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It is cleaner to eat from a toilet, compared to the drain, he says, referring to the kitchen drain. The sink drain is the dirtiest area of the house. It's closely followed by the kitchen sponge, he adds. A 2011 study by NSF International , a consumer safety organization, categorized the household objects with the highest germ count. Only differing slightly from Tierno, they found sponges and dish rags were the dirtiest household items, followed by kitchen sinks, toothbrush holders, pet bowls, coffee reservoirs, bathroom faucet handles, pet toys, countertops, stove knobs, and cutting boards. There are three ways that human beings generate germs, says Tierno. The first is the skin. Your biggest organ is a home to hundreds of different kinds of germs, and everyday they slough off. The second source of germs comes from your respiratory treeyour mouth and nose. Talking, coughing, and sneezing are common ways to impart germs into the air. The third way humans generate germs is found at the opposite end of the body. There are more germs in a single teaspoon of feces than there were men who walked the face of the Earth, says Tierno.
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