Usutuvirus is a common cause of mortality in different songbirds and has also been found in ducks. The virus is transmitted by Culex mosquitoes. Zoonotic transmission to humans is possible but the risk is very low.

Swine pneumovirus, a recently detected virus, causes deep respiratory infections in pigs. It is genetically related to respiratory syncytial viruses in humans and cattle, known for causing infectious bronchiolitis.