A dead crow found in Roseville tested positive for West Nile virus.
The bird is the second case of West Nile virus in the county in 2005, states a county news release.
In February, an infected bird was found in Lincoln.
Last year, Placer County had infected birds, mosquitoes, chickens, horses and one human case, the release states.
Crows are especially susceptible to West Nile virus, Jamesina Scott, a vector ecologist for the Placer Mosquito Abatement District, said in the release.
If a dead bird is found, call (877) 968-2473 to report it, or report it online at www.westnile.ca.gov.