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.
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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.