Pasadena Health Department Warns Residents as West Nile Virus Activity Spikes

Aedes albopictus mosquito (Photo – James Gathany, CDC).

The Pasadena Public Health Department (PPHD) is urging residents to take immediate precautions against mosquito bites as West Nile virus (WNV) activity hits its highest levels in California in five years.

By News Desk

The warning comes as the state enters the peak transmission period of August and September. According to the California Department of Public Health (CDPH), there have been 30 reported human cases of the virus across 13 counties as of August 14, including three fatalities. Local concerns have escalated following the Los Angeles County Department of Public Health’s confirmation of the first local death due to WNV on August 20.

The threat has reached the city’s doorstep, with the San Gabriel Valley Mosquito and Vector Control District confirming the first detection of WNV in Pasadena this year. The virus was found in a mosquito trap site collected on August 13.

“Most people infected with West Nile virus do not develop symptoms, but a small percentage can develop serious, potentially life-threatening illness,” said Health Officer Dr. Parveen Kaur. “As we enter peak transmission season, I urge everyone to take simple steps to prevent mosquito bites and eliminate standing water around their homes.”

Health officials note that while about 80% of infected individuals experience no symptoms and 20% develop a mild fever, less than 1%—roughly 1 in 150 people—develop severe neurological illnesses like encephalitis or meningitis. Those at the greatest risk for severe illness include older adults, individuals with weakened immune systems, and those with certain underlying health conditions.

To stay safe, the PPHD recommends practicing the “Three Ds”:

• DEET: Use EPA-registered insect repellents containing picaridin, oil of lemon eucalyptus, IR3535, or DEET. When used as directed, DEET is safe for children and those who are pregnant or breastfeeding.
• Dawn and Dusk: Wear long pants and sleeves and apply repellent when outdoors during the early morning and evening. Residents should also ensure window and door screens fit tightly.
• Drain: Remove standing water from tires, buckets, flowerpots, and other containers around the home.

The public is also asked to help track the spread of the virus by reporting dead birds, as birds can carry the virus and may die from it. Reports can be made at the California West Nile Virus website or by calling 1-877-WNV-BIRD (968-2473).