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Bacteria live everywhere in the air, in soil, in water, in food, and on every sort of plant and animal. They live inside our bodies and, while some bacteria are harmful to humans and other animals because they can cause disease, we could not live without them. They make our digestive systems work and help eliminate waste from our bodies to keep us alive and well. Only certain bacteria are harmful to us, and these can pretty well be controlled by cleanliness, including frequent hand washing and being careful not to release disease-carrying bacteria by sneezing, coughing, or spitting.

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15y ago

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