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, who incorrectly described "Haemophilus influenzae" as the causative microbe, which retains "influenza" in its name.