Parainfluenza Virus 1, Human

**Definition:** A species of RESPIROVIRUS also called hemadsorption virus 2 (HA2), which causes laryngotracheitis in humans, especially children.

**Tree numbers:** - B04.820.480.937.600.650.700.715

**Synonyms:** - Hemadsorption Virus 2 - Human parainfluenza virus 1