Two dead birds found in the Central Valley have tested positive for West Nile virus.

The Western scrub jay that was found in the Antelope area and examined by the district is the second bird that has tested positive for the virus in the area for 2008, the Sacramento-Yolo Mosquito and Vector Control District said.

An infected American crow was found near Herald in March.

However, the jay is the first infected bird found this year in an urban area, the district said.

"We saw a rise in the temperatures a few weeks ago, and mosquitoes are definitely out," district manager David Brown said. "It is extremely important that the public drain any standing water around their home and take the necessary precautions to protect themselves. More people are out and about in the early morning and evening hours, so please dress appropriately or wear an effective mosquito repellent."

In addition, an American crow found in the Tracy area tested positive for the virus on Wednesday, the San Joaquin County Mosquito and Vector Control District said.