Haemophilus parainfluenzae

**Semantic type:** Bacterium

**Definition:** A species of facultatively anaerobic, Gram negative, coccobacilli shaped bacteria assigned to the phylum Proteobacteria. This species is oxidase, urease and porphyrin positive, can grow in culture with V factor alone, and requires putrescines for growth in culture. H. parainfluenzae is a commensal organism of the oral cavity and pharynx but may become pathogenic in immunocompromised individuals or individuals with underlying disease, being a causative agent of endocarditis.

**Synonyms:** - HAEMOPHILUS PARAINFLUENZAE - Hemophilus parainfluenzae - Hemophilus parainfluenzae