A fourth San Diego County resident has tested positive for West Nile virus since June, prompting public health officials to remind the public about the importance of preventing mosquito bites.
No local deaths have been reported yet this year, but one of the recent cases required several days of hospitalization. Another had mild symptoms that did not require hospitalization, and two were detected through blood-donation screening. One of the cases was acquired locally.
“In 2025 there were no human cases in San Diego County, but health officials saw an uptick in infected mosquitoes and dead birds,” the county said.
“Last year, 34 dead birds and 182 mosquito batches tested positive for West Nile virus. So far in 2026, the virus has been detected in 23 dead birds and 10 mosquito batches.”
Similar increases in West Nile are being seen across California and neighboring states, the county added.
Mosquito season typically starts in April. The virus is primarily an avian disease, but it can be transmitted to humans when certain types of mosquitoes feed on an infected bird.
The county is asking 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.
Residents are 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.
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. However, 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.
Mosquito activity or mosquito breeding sources can be reported to the Vector Control Program by calling (858) 694-2888 or emailing [email protected].
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