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Morganella morganii
''Morganella morganii'' is a species of Gram-negative bacteria.〔eMedicine. (Morganella infections )〕 It has a commensal relationship within the intestinal tracts of humans, mammals, and reptiles as normal flora.〔(eMedicine )〕 Although ''M. morganii'' has a wide distribution, it is considered an uncommon cause of community-acquired infection and it is most often encountered in postoperative and other nosocomial infections such as urinary tract infections.〔(【引用サイトリンク】url=http://emedicine.medscape.com/article/222443-overview#a0101 )〕
==Historical identification and systematics==
''M. morganii'' was first described by a British bacteriologist H. de R. Morgan in 1906 as Morgan's bacillus. Morgan isolated the bacterium from stools of infants who were noted to have had "summer diarrhea". Later in 1919, Winslow'' et al.'' named Morgan's bacillus, ''Bacillus morganii''. In 1936, though, Rauss renamed ''B. morganii'' as ''Proteus morganii''. Fulton, in 1943, showed that ''B. columbensis'' and ''P. morganii'' were the same and defined the genus ''Morganella'', due to the DNA-DNA hybridization. ''M. morganii'' has two subspecies - ''M. m. morganii'' and ''M. m. columbensis''. However in 1962, a review article by Ewing reported that ''M. columbensis'' had been reidentified as ''Escherichia coli'', therefore removing that organism from the genus., ''Morganella''.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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