Krasan, Graham P. University of Michigan Medical School, Ann Arbor, Michigan.
St. Geme, Joseph W. Department of Pediatrics, Washington University School of Medicine, St. Louis, Missouri.
Last reviewed:November 2020
- Human infections
- Related Primary Literature
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A genus of Gram-negative, pleomorphic bacteria, including a number of pathogenic members. Bacteria belonging to the genus Haemophilus (see illustration) are facultative anaerobes and are nonmotile and non-spore-forming. In addition, they are pleomorphic, having the ability to occur in more than one distinct form in a single life cycle. Haemophilus bacteria have fastidious growth requirements, including factor X (provided by hemin or other porphyrins) or factor V [provided by nicotinamide adenine dinucleotide (NAD), nicotinamide adenine dinucleotide phosphate (NADP), or nicotinamide nucleoside], or both, depending on the species. Erythrocytes (red blood cells) represent an exogenous source of these factors. See also: Bacteria; Bacterial growth; Bacteriology; Pathogen
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