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''Peptostreptococcus'' is a genus of anaerobic, Gram-positive, non-spore forming bacteria. The cells are small, spherical, and can occur in short chains, in pairs or individually. ''Peptostreptococcus'' are slow-growing bacteria with increasing resistance to antimicrobial drugs. The most frequently identified species of ''Peptostreptococcus'' is ''P. magnus''. == Pathogenesis == ''Peptostreptococcus'' species are commensal organisms in humans, living predominantly in the mouth, skin, gastrointestinal, vagina and urinary tracts, and compose a portion of the bacterial gut flora. Under immunosuppressed or traumatic conditions these organisms can become pathogenic, as well as septicemic, harming their host. ''Peptostreptococcus'' can cause brain, liver, breast, and lung abscesses, as well as generalized necrotizing soft tissue infections. They participate in mixed anaerobic infections, a term which is used to describe infections that are caused by multiple bacteria that do not require or may even be harmed by oxygen. ''Peptostreptococcus'' species are susceptible to beta-lactam antibiotics.〔Brook I. Treatment of anaerobic infection. Expert Rev Anti Infect Ther. 2007 ;5:991-1006〕 They are isolated with high frequency from all specimen sources. Anaerobic gram-positive cocci such as ''Peptostreptococcus'' are the second most frequently recovered anaerobes and account for approximately one quarter of anaerobic isolates found. Most often Anaerobic gram-positive cocci are usually recovered mixed in with other anaerobic or aerobic bacteria from various infections at different sites of the human body. This contributes to the difficulty of isolating ''Peptostreptococcus'' organisms.〔Finegold SM. Anaerobic Bacteria in Human Disease. Orlando, Fla: Academic Press; 1977.〕 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「Peptostreptococcus」の詳細全文を読む スポンサード リンク
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