"No specific treatment available.
Mosquito-borne arbovirus. Genus Flavivirus.
Birds serve as the prime reservoir host
especially passerines.
Virus is found in temperate and tropical regions of the world.
First identified in the West Nile subregion.
Now spread to USA & Europe.
2012 outbreak in Texas killed 280 people.
80% of West Nile virus infections in humans are subclinical."