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KembaraXtra - Medical Terms - Actinomyces Actinomyces is a genus of Gram-positive bacteria that resemble fungi in appearance, although they are true bacteria. These organisms are nonmotile and typically grow in branching filamentous forms. They are normally present in the human mouth and other body sites but can sometimes cause disease.


One important species, Actinomyces israelii, is responsible for the infection known as actinomycosis. When these bacteria invade deeper tissues, usually following dental infections or injury, they can produce chronic infections characterized by swelling and abscess formation. Their fungus-like appearance historically led to confusion regarding their classification.

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