The graphics below show the type and number of mosquito breeding sources and the number of acres treated by our Vector Control Technicians in June and July, 2015. For a larger view, click the graphics.
In 2015 to date, nine dead birds and five mosquito samples have tested positive for West Nile Virus. No sentinel chickens or humans have tested positive for West Nile virus in San Mateo County this year.
In 2014, 20 dead birds and 15 mosquito samples in San Mateo County tested positive for West Nile virus. No sentinel chickens or humans tested positive in 2014.
California Department of Public Health (CDPH) Director and State Health Officer Dr. Karen Smith today announced that the department, working closely with Yosemite National Park, successfully reduced the risk of plague transmission at Crane Flat Campground in Yosemite. The campground, which had been closed for four nights to allow for rodent burrows to be treated for fleas, is reopening today. The treatment controlled potentially plague-infected fleas which could spread the disease to humans and other warm-blooded hosts.