2 West Nile virus cases confirmed in Pasadena

The Pasadena Public Health Department (PPHD) confirmed Thursday two cases of West Nile virus infection in city residents.

These cases are the first human West Nile virus infections reported in Pasadena this year, prompting health officials to urge residents to take precautions to avoid mosquito bites. The last confirmed case in a Pasadena resident was recorded in 2025.

According to the PPHD, both cases meet the clinical criteria and have preliminary lab results consistent with the infection, although confirmatory testing is still pending.

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According to the California Department of Public Health, as of Oct. 23, 2026, 452 human West Nile virus cases had been reported statewide, along with 29 deaths across 24 counties. Of those cases, 251 were recorded in Los Angeles County.

By comparison, around the same time last year, 67 human cases had been reported in 15 California counties.

Health officials explained that the virus is detected more frequently during the warmer months, when mosquito populations increase and the disease can spread quickly.

They also said they will continue monitoring the situation as the Pasadena Public Health Department works in collaboration with the San Gabriel Valley Mosquito and Vector Control District to address increased mosquito activity in public areas through regular inspections and the application of necessary treatments.

“West Nile virus is spread to people through the bite of an infected mosquito. Most people who contract the virus do not have symptoms. However, a small percentage may develop a potentially life-threatening illness. There is no vaccine or cure for the disease caused by West Nile virus,” said Dr. Parveen Kaur, a public health official, in a statement.

Meanwhile, Public Health Director Manuel Carmona said the most effective way to protect yourself is to prevent mosquito bites and actively help reduce the risk of West Nile virus transmission by following prevention recommendations.

Health officials recommend taking the following steps to reduce mosquitoes and avoid bites:

• Check around your home weekly to identify and eliminate any standing water where mosquitoes can breed.
• Throw out unused containers that can collect water, such as buckets, plant saucers, tires, and other items.
• Install screens on doors and windows and repair any holes or damage that could allow mosquitoes inside.
• Wear protective clothing, such as long-sleeved shirts and long pants, to reduce skin exposure.
• Apply insect repellent containing one of the following ingredients: picaridin, DEET, oil of lemon eucalyptus, or IR3535.

According to health officials, birds can carry West Nile virus.

Various reports have noted that some birds can become seriously ill and even die as a result of the infection. For this reason, residents are encouraged to report any dead birds they find.

Reports can be made through the California Department of Public Health’s West Nile virus website HERE. You can also call 877-968-2473.

Officials reiterated the importance of the community taking preventive steps to reduce mosquito activity and lower the risk of contracting the disease.