Haemophilus influenzae

Haemophilus influenzae (formerly called Pfeiffer's bacillus or Bacillus influenzae) is a Gram-negative, coccobacillary, facultatively anaerobic capnophilic pathogenic bacterium of the family Pasteurellaceae. H. influenzae was first described in 1892 by Richard Pfeiffer during an influenza pandemic.[1] He incorrectly described Haemophilus influenzae as the causative microbe, which retains "influenza" in its name.[2][3]

Haemophilus influenzae
H. influenzae on a chocolate agar plate
Scientific classification
Domain: Bacteria
Phylum: Pseudomonadota
Class: Gammaproteobacteria
Order: Pasteurellales
Family: Pasteurellaceae
Genus: Haemophilus
H. influenzae
Binomial name
Haemophilus influenzae
(Lehmann & Neumann 1896)
Winslow et al. 1917
Haemophilus influenzae infection
Haemophilus influenzae satellite colonies (pin points) near Staphylococcus aureus (yellow) on blood agar plate
SpecialtyInfectious disease

The bacterium was argued by some to be the cause of influenza[4] as bacterial influenza. H. influenzae is responsible for a wide range of localized and invasive infections, but influenza is caused by viruses.

This species was the first free-living organism to have its entire genome sequenced.[5]

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