Los Angeles County records first West Nile virus fatality of 2026
A San Fernando Valley resident died from severe West Nile virus, prompting county health officials to urge mosquito-bite precautions as infections rise above the five-year average.
Los Angeles County health officials confirmed the first West Nile virus death of the year, involving a resident of the San Fernando Valley who was hospitalized with a neurological illness. The county has recorded 15 human infections so far, a figure that exceeds the five-year average for this point in the season, and half of those cases are from the San Fernando Valley.
"We extend our heartfelt condolences to the family and friends grieving the loss of a loved one due to West Nile virus," said Los Angeles County Health Officer Dr. Muntu Davis, adding that the death underscores the serious threat of mosquito-borne diseases. Dr. Davis recommended using insect repellent, eliminating standing water, and ensuring window and door screens are intact.
The state health department reported that West Nile activity is at its highest level in five years, with 30 human cases, including three deaths, across 13 California counties. State Health Officer Dr. Erica Pan warned that the virus can be fatal, especially for older adults and immunocompromised individuals, and urged residents to protect themselves during the peak transmission months of August and September.
Surveillance data show the virus in 32 counties, with 24% of dead birds testing positive—well above the five-year average of 13%—and eight out of every 1,000 mosquitoes carrying the virus, compared with five per 1,000 historically. Susanne Kluh, general manager of the Greater Los Angeles County Vector Control District, noted that warm winter conditions led to an early start in virus amplification, resulting in widespread activity despite lower mosquito numbers. She advised the public to apply repellent, particularly at dawn and dusk.
West Nile virus is spread by infected mosquito bites; most infections are asymptomatic, while about 20% cause fever and other symptoms, and roughly one in 150 develop severe illness such as meningitis or encephalitis. People over 50 and those with certain health conditions are at higher risk, and no vaccine or specific treatment is currently available.