Haemophilus influenzae

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Also known as: Bacillus influenzae
Haemophilus influenzae bacteria cultured on a blood agar plate. (MarcoTolo 2006, Wikimedia commons)


Haemophilus influenzae is a species of the Haemophilus genus.

There are unencapsulated and encapsulated strains. Encapsulated strains can be classified by their capsular antigens. There are six types of encapsulated Haemophilus influenzae; a, b, c, d, e, and f.

Most strains of H.influenzae are opportunistic pathogens. Haemophilus influenzae can cause; Human meningitis, septicaemia, bronchopneumonia, conjunctivitis, epiglottitis, and otitis