More than 340 new West Nile Virus-positive mosquito samples were collected across California in the past week, including several in San Joaquin and Stanislaus counties. San Joaquin County Mosquito and Vector Control District Public Information Officer Aaron Devencenzi said residents still need to be vigilant in protecting against mosquitoes as we wind through the late summer and early fall months. “As long as people continue to see mosquitoes outdoors, it’s important to take precautions,” he said.