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] who incorrectly described Haemophilus influenzae as the causative microbe, which retains "influenza" in its name.[2][3]
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]
https://en.wikipedia.org/wiki/Haemophilus_influenzae
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