The orange county Mosquito and Vector Control District has confirmed a concerning outbreak of West Nile Virus a mosquito-borne illness that can be deadly. Last week, over 101 mosquito pools tested positive for the virus, with Fullerton being the most affected city, reporting 39 positive samples. Buena Park, Anaheim, and potentially Cypress are also at risk.
Brian Brannon a district spokesman, stated, “We are well on track to have a bad year of West Nile Virus.” The district is actively monitoring and controlling mosquito populations to mitigate the spread of the virus.
Understanding the West Nile Virus
The West Nile Virus originated in Africa and spread to the eastern U.S. in 1999. It is now the leading cause of mosquito-borne disease in the United States, according to the Center for Disease Control and Prevention (CDC). The virus is primarily carried by the Culex mosquito which typically bites birds but can also bite humans.
Most human infections are asymptomatic, with about 80% of people showing no symptoms. However, the remaining 20% can experience mild symptoms such as fever, vomiting, and body aches. In severe cases, the virus can affect the central nervous system, leading to hospitalization or even death. Kiet Nguyen a Vector Ecologist, emphasized, “The severe case of West Nile Virus is encephalitis, meaning bacterial encephalitis to the spine and the head, and it can actually kill people and paralyze people.”
Protecting Yourself from West Nile Virus
As the summer season brings an increase in mosquito activity, residents are urged to take precautions to protect themselves. Nguyen recommends using EPA-approved and FDA-approved repellents such as DEET, Picaridin, and lemon eucalyptus. Wearing long-sleeved shirts and pants can also help prevent mosquito bites.
Reducing sources of standing water is crucial in minimizing mosquito breeding grounds. Residents should dump and drain any standing water once a week to kill bacteria or larvae. The district offers free mosquitofish, which eat mosquito larvae and pupae, to help control the mosquito population. “Any type of repellency is the way to go right now,” Nguyen advised.
The district’s data indicates that the number of West Nile positive mosquito pools at the end of 2026 was 186, with an estimated 500 positive samples expected county-wide by the end of 2026. With the virus posing a significant threat, especially to the elderly and young, taking preventive measures is essential for the safety of all residents.
