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The 8th edition of Bergey's Manual of Determinative Bacteriology (14) includes 14 species in the genus Haemophilus with an additional 5 species incertae sedis. Ten of these species other than Haemophilus injluenzae have been associated with human infections and this review covers selected clini cal and microbiological aspects related to these species. One species listed 0066-4227/82/1001-0199$02.00 ALBRITTON under the name Haemophilus vaginalis was considered not to belong in the genus Haemophilus. Recent studies support inclusion of this organism in a separate genus, Gardnerella, and it is not discussed in this review (103). MICROBIOLOGY The genus Haemophilus was created by the American Committee on Clas sification and Nomenclature in 1920 to include a number of hemophilic organisms (140). Presently, however, the genus is restricted to gram-nega tive, facultatively anaerobic, rod-shaped bacteria requiring hemin or certain other porphyrins (X-factor) and/or nicotinamide adenine dinucleotide (NAD) or certain definable coenzyme-like substances (V-factor) (142). The type species, H. in./luenzae, however, was isolated and described by Pfeiffer in 1892 in association with a clinical syndrome, and it was originally re garded to be the etiologic agent of influenza (102). Although the etiologic agent of acute contagious conjunctivitis (H. aegyptius) had been described by Koch
Annual Review of Microbiology – Annual Reviews
Published: Oct 1, 1982
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