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Haemophilus : ウィキペディア英語版
Haemophilus

''Not to be confused with Haemophilia''
''Haemophilus'' is a genus of Gram-negative, pleomorphic, coccobacilli bacteria belonging to the Pasteurellaceae family. While ''Haemophilus'' bacteria are typically small coccobacilli, they are categorized as pleomorphic bacteria because of the wide range of shapes they occasionally assume. The genus includes commensal organisms along with some significant pathogenic species such as ''H. influenzae''—a cause of sepsis and bacterial meningitis in young children—and ''H. ducreyi'', the causative agent of chancroid. All members are either aerobic or facultatively anaerobic.
==Metabolism==
Members of the ''Haemophilus'' genus will not grow on blood agar plates, as all species require at least one of these blood factors for growth: hemin (factor X) and/or nicotinamide adenine dinucleotide (factor V). Chocolate agar is an excellent ''Haemophilus'' growth medium, as it allows for increased accessibility to these factors. Alternatively, ''Haemophilus'' is sometimes cultured using the "Staph streak" technique: both ''Staphylococcus'' and ''Haemophilus'' organisms are cultured together on a single blood agar plate. In this case, ''Haemophilus'' colonies will frequently grow in small "satellite" colonies around the larger ''Staphylococcus'' colonies because the metabolism of ''Staphylococcus'' produces the necessary blood factor byproducts required for ''Haemophilus'' growth.

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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