Certain species of birds serve as good sentinels for indicating the presence of West Nile virus in
an area. Corvid birds (jays, crows, ravens, magpies) and raptors have been found to be
particularly susceptible to the virus. They become infected when fed upon by mosquitoes
carrying the virus. Laboratory analysis of dead birds is often the first indication of West Nile
virus in a community.

Local health jurisdictions serve as the focal point for collection of dead birds. They have been
provided with collection protocols and materials, shipping containers, and FedEx mailing
envelopes. Samples are shipped directly to the National Wildlife Health Center Laboratory in
Madison, Wisconsin for testing.