Tags: Bacteria.
Haemophilus influenzae (formerly called Pfeiffer’s bacillus or Bacillus influenzae) is a Gram-negative coccobacillary facultatively anaerobic bacterium belonging to the Pasteurellaceae family. H. influenzae was first described in 1892 by Richard Pfeiffer during an influenza pandemic. The bacterium was mistakenly considered to be the cause of influenza until 1933 when the viral etiology of influenza became apparent and is still colloquially known as ‘bacterial influenza’. H.
