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Haemophilus
(he-mof´ĭ-lәs)
a genus of hemophilic gram-negative bacteria. H. aphro´philus, H. parainfluen´zae, and H. paraphro´philus are part of the normal oral flora and are occasionally associated with endocarditis. Pathogenic species include H. aegyp´tius, the cause of pinkeye (acute contagious conjunctivitis); H. ducrey´i, the cause of chancroid; and H. influen´zae, a species once thought to cause epidemic influenza. A species formerly called H. vagina´lis is now called Gardnerella vaginalis.. H. influenzae type b, rather than causing influenza, can cause meningitis, pneumonia, and serious throat and ear infections, particularly in children under the age of five years; vaccination against it is recommended
for all children.
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