In the Sacramento area, an aerial spraying program is in effect. News reports advised of cases of West Nile virus. Deaths from the disease were also reported but I don't have numbers.
I believe the Sacramento Bee this weekend said there were 36 confirmed cases. I don't recall how many deaths, if any...
The more amazing thing to me was that they said it could potentially wipe out entire populations of birds, such as the yellow beaked magpie (Not sure of the name - but a magpie). Members of the Corvid family (Ravens, Crows) are apparently also very vulnerable.