California's First West Nile Virus Case Sparks Health Alert

California has recorded its first human case of West Nile virus for the 2026 season. Officials in Long Beach confirmed the case on Friday, stating the infected person was hospitalized with neuroinvasive illness and is now recovering at home. This event follows previous detections of WNV-positive mosquitoes in the region.

The virus, spread by infected Culex mosquitoes, typically presents mild or no symptoms. However, about one in 150 infected individuals can develop severe conditions like brain inflammation or paralysis. Symptoms may include fever, body aches, headaches, nausea, and vomiting.

Health authorities emphasize that the risk of West Nile virus and other mosquito-borne diseases escalates during hot weather, particularly from June through October. Those aged over 55 and individuals with pre-existing chronic health conditions are at a greater risk for severe outcomes.

Preventative measures recommended by acting City Health Officer Dr. Cliff Okada include using EPA-registered insect repellents, wearing protective clothing at dawn and dusk, ensuring window screens are intact, and eliminating standing water around homes. Residents experiencing WNV symptoms should seek immediate medical attention. More information is available at longbeach.gov/mosquitoes.