Expansion of West Nile Virus Threat in San Diego County
West Nile virus activity is increasing in San Diego County, with recent detections in neighborhoods and ongoing mosquito control efforts, highlighting the need for preventative measures against mosquito bites.
The West Nile virus continues to pose an increasing health concern in San Diego County, with recent routine mosquito and bird testing revealing the presence of the virus in neighborhoods such as City Heights and Skyline. This detection follows a mosquito control effort in July, which involved treating roughly 4,000 parcels in the nearby Rolando area, situated just south and east of San Diego State University, as well as parts of La Mesa in East County.
Although there have been no confirmed cases of human infection so far, 2025 marks the first season since 2023 that local mosquitoes and avian populations have tested positive for West Nile virus during scheduled surveillance activities. County officials note that this uptick in activity is part of the virus’s cyclical pattern, which is influenced by various environmental factors, particularly weather conditions.
The County’s Vector Control Program is actively addressing the situation by treating mosquito breeding sites in affected areas; however, no neighborhood-wide spraying has been announced recently, unlike the targeted treatments in July.
Residents are advised to take precautions against mosquito bites by using insect repellent outdoors, wearing long-sleeved clothing, and eliminating standing water on their properties to reduce mosquito breeding sites. For those struggling to control mosquito populations, free inspection services are available through the County’s Vector Control, which can be contacted at (858) 694-2888 or via email at vector@sdcounty.ca.gov. The 'Tell Us Now!' app also facilitates requesting inspections.
While most West Nile virus infections are mild, symptoms such as headache, fever, nausea, fatigue, rash, and swollen glands can occur. Severe cases are rare but can lead to hospitalization and, in some instances, be fatal.
Health officials emphasize the importance of ongoing vigilance and preventative measures to limit the risk of infection during the mosquito active season. For more information, visit https://medicalxpress.com/news/2025-09-west-nile-virus-footprint-san.html.
Stay Updated with Mia's Feed
Get the latest health & wellness insights delivered straight to your inbox.
Related Articles
Low Hepatitis B Surface Antigen Levels Indicate Very Low Liver Cancer Risk, Redefining 'Partial Cure'
New research shows that hepatitis B patients with surface antigen levels below 100 IU/mL face a negligible risk of liver cancer, potentially redefining treatment and surveillance protocols. This breakthrough can help identify a 'partial cure' and optimize care for millions worldwide.
Real-World Data Demonstrates Benefits of Teclistamab for Diverse Multiple Myeloma Patients
New real-world evidence shows that teclistamab can provide meaningful benefits to a broader range of multiple myeloma patients, including those with high-risk features and previous therapies, beyond the initial clinical trial population.
Impact of Climate Change on the Spread of Dengue Fever in Western Europe
Climate change is expanding the habitat of the Asian tiger mosquito into Western Europe, increasing the risk of dengue fever and other mosquito-borne diseases in previously unaffected regions.
The Power of Listening in Cardiac Rehabilitation: Enhancing Patient Recovery through Empathy
Effective healing in cardiac rehabilitation relies on empathy and active listening. Understanding patients' social, cultural, and emotional experiences is key to designing personalized recovery programs and improving outcomes.