Pasadena Public Health Confirms Case of West Nile Virus and Recommends Prevention Tips

PASADENA, Calif. - The Pasadena Public Health Department (PPHD) confirms their first case of West Nile virus (WNV) in a human for 2025 on October 9, 2025, and recommends prevention tips.

WNV is most often detected during warmer months when mosquitoes are breeding and can quickly spread viruses. PPHD continues to monitor disease activity and collaborate with the San Gabriel Valley Mosquito & Vector Control District to control mosquitoes in public spaces through routine inspections and necessary treatments. The last confirmed case of WNV in a Pasadena resident was in 2022.

"There is no vaccine or cure for West Nile virus in humans," said Dr. Parveen Kaur, Acting Health Officer. "By taking preventive measures, we can reduce the risk of infection and help protect our community."

Take the following actions to reduce the presence of mosquitoes, stay healthy and bite-free:

• Tip out stagnant water around the home weekly;

• Toss unused containers that can hold stagnant water;

• Use screens on windows and fix holes in screens; and

• Protect against bites by wearing protective clothing and using insect repellent containing any one of the following recommended ingredients: Picaridin, DEET, Oil of Lemon Eucalyptus (or PMD), or IR3535.

"PPHD urges residents to take an active role in reducing the threat of West Nile virus by following mosquito prevention tips," said Manuel Carmona, Director of Public Health. "The most effective way to stay protected is to prevent mosquito bites."