The first and only human case this year was reported in Tulare County in June, but the woman was not hospitalized. Contra Costa, Santa Clara and San Mateo Counties are the other Bay Area Counties that have also reported West Nile virus activity in animals this year.
Solano County Public Health Services is asking residents to take extra precaution for outdoor activities during the Fourth of July.
Simple tips include wearing pants and long sleeves during dawn and duck, use insect repellents, keeping doors and windows closed, draining standing water and reporting dead birds by calling 1-(877) WNV-BIRD, which is 1-(877) 968-2473.
Last year, Solano County reported one human case that was also non-fatal. Public Health Education Manager Robin Cox said at the county found a dead bird at the same time last year, almost to the day.
Cox said about 80 percent of infected people will not even show symptoms. About 19 percent will show mild flu symptoms and the other percentile, most commonly people with prior health problems, suffer from major severe complications.
The California Department of Public Health reported 21 West Nile virus human deaths in 2007.