A fourth San Diego County resident has tested positive for West Nile virus this summer, prompting public health officials Tuesday to offer steps to prevent mosquito bites. No local deaths have been reported this year, however one of the recent cases required several days of hospitalization. Anoth er had mild symptoms that did not require hospitalization, and two were detected through blood-donation screening. One of the cases was acquired locally. Mosquito season typically starts in April, but the county reminded everyone to follow three steps: Prevent, Protect and Report: Prevent mosquito breeding at home, protect yourself from bites and report mosquitoes and dead birds to the Vector Control Program. “One of the best ways to stop mosquitoes is to remove standing water around your home, so they can’t breed in it,” a county statement said. Residents were urged to dump out standing water or remove items that can hold water, such as plant saucers, rain barrels, buckets, garbage cans, toys, old tires and wheelbarrows. The Vector Control Program is also offering free mosquito fish, which can be placed in stagnant water sites to control mosquito breeding. Residents were also advised to wear long sleeves and pants, and wear insect repellent while outdoors to protect themselves. The virus is primarily a bird disease but can be transmitted to humans when certain types of mosquitoes feed on an infected bird and then bite a person. West Nile virus remains a potentially deadly threat. In 2015, 44 San Diego County residents tested positive for West Nile virus, six of whom died. So far in 2026, the virus has been detected in 23 dead birds and 10 mosquito batches. Similar increases are being seen across California and neighboring states. Most people who get West Nile virus have no symptoms or mild symptoms such as headaches, fever, nausea, feeling tired, skin rash or swollen glands. In rare cases, it can make people very sick or even cause death. Mosquito activity or mosquito breeding sources can be reported to the Vector Control Program by calling 858-694-2888 or emailing [email protected]. ...read more read less