10/01/2025
⚠️ West Nile Virus Detected in San Diego Mosquitoes
San Diego, Calif. — County health officials are alerting residents after mosquitoes in several neighborhoods across San Diego County tested positive for West Nile virus, a disease that can be spread to humans through mosquito bites.
While most people infected with West Nile show no symptoms, some may experience fever, headache, body aches, nausea, or swollen lymph nodes. In rare but severe cases, the virus can cause neurological illness such as meningitis or encephalitis, which may be life-threatening.
🔺What the County Is Doing
The County of San Diego’s Vector Control Program has mailed out notices to affected neighborhoods and is actively responding to the detections. Crews have increased surveillance by setting up mosquito traps, testing captured insects, and treating standing water in public areas like parks, storm drains, and flood control channels. Vector Control teams are also inspecting neglected swimming pools and other potential breeding sites, as well as responding to resident reports of mosquito activity.
What You Can Do to Stay Safe âś…
• Dump standing water around your home — mosquitoes can breed in just a bottle cap’s worth of water. Check buckets, tires, birdbaths, gutters, and plant saucers.
• Use EPA-registered repellents with active ingredients such as DEET, picaridin, IR3535, or oil of lemon eucalyptus.
• Wear long sleeves and pants, especially at dawn and dusk when mosquitoes are most active.
• Maintain and secure screens on windows and doors to prevent mosquitoes from getting inside.
• Report dead birds, high mosquito activity, or unmaintained swimming pools to County Vector Control by calling 858-694-2888 or emailing [email protected].
🔺Why It Matters
West Nile virus typically peaks in late summer and early fall, but this year’s recent hot weather combined with leftover standing water from storms has created perfect breeding conditions. County officials stress that even small amounts of water — like in a soda can or clogged gutter — can produce hundreds of mosquitoes.
By taking simple precautions at home and reporting problem areas, residents can play a key role in helping keep San Diego safe.
👉 Share this post to spread awareness with your family, friends, and neighbors. Together, the community and the County can help slow the spread of West Nile virus in San Diego.