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''Mycobacterium africanum'' is a species of ''Mycobacterium'' that is most commonly found in West African countries. The symptoms of infection resemble those of ''M. tuberculosis''. It is a member of the Mycobacterium tuberculosis complex. ==Epidemiology== ''M. africanum'' is most commonly found in West African countries, causing up to a quarter of cases of tuberculosis in countries such as the Gambia. It is an infection of humans only and is spread by an airborne route from individuals with open cases of disease. It has a similar degree of infectivity to the regular ''M. tuberculosis'' organism but is less likely to progress to clinical disease in an immunocompetent individual. ''M. africanum'' is more likely to progress from infection to causing disease in an HIV positive patient, hence in countries where ''M. africanum'' is endemic, it represents an important opportunistic infection of the later stages of HIV disease. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Mycobacterium africanum」の詳細全文を読む スポンサード リンク
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