West Nile Virus Transmission Cycle
Current as of: June 9, 2019
Author: Healthwise Staff
Medical Review:E. Gregory Thompson, MD – Internal Medicine & Adam Husney, MD – Family Medicine & Leslie A. Tengelsen, PhD, DVM – Epidemiology
Illustration copyright 2005. Adapted from the U.S. Centers for Disease Control and Prevention. Available online: http://www.cdc.gov Mosquitoes become infected with West Nile virus when they bite infected birds. And then they may transmit the virus to humans and animals when they bite to take blood.