The Alameda County Mosquito Abatement District announced Thursday via its Twitter account new cases of West Nile virus in the area.
Officials report a squirrel in Livermore and three crows in the Fremont/Newark area have tested positive for the virus.
Alameda County now has five birds and a squirrel that have tested positive for West Nile, the district said.
The national figures reflect a 40 percent increase in West Nile virus cases since last week.
Those stats indicate the number of cases may rival the record years of 2002 and 2003, the Associated Press reported.
Alameda County officials reported earlier this month that a .