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actinomycosis ac·ti·no·my·co·sis (āk'tə-nō-mī-kō'sĭs)
An inflammatory disease of cattle, hogs, and sometimes humans, caused by microorganisms of the genus Actinomyces and characterized by lumpy tumors of the mouth, neck, chest, and abdomen.
a noncontagious bacterial infection of humans and cattle that is caused by two anaerobic species of the genus Actinomyces. The disease is characterized by multiple painful, hard swellings filled with pus, most often seen on the face, neck, chest, and abdomen. Actinomyces bovis is responsible for the disease in cattle and Actinomyces israeli for that in humans.