Haemophilus parainfluenzae

**Definition:** A species of gram-negative bacteria in the genus HAEMOPHILUS, ubiquitous in the human ORAL CAVITY and PHARYNX. It has low pathogenicity but is occasionally implicated in ENDOCARDITIS in humans.

**Tree numbers:** - B03.440.450.600.450.675 - B03.660.250.550.290.675

**Synonyms:** - Hemophilius parainfluenzae