Atypical mycobacteria are a group of bacteria that are widely distributed in nature. They can be found in water, soil, unpasteurized milk, and animals and may cause disease in humans. Many people become infected with and harbor atypical mycobacteria without any symptoms or evidence of disease. In some individuals, however, infection with these organisms may result in disease involving the lungs, skin, lymph nodes, or other parts of the body.
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