5 Dead As West Nile Virus Cases Surge Across LA County

LOS ANGELES, CA — Los Angeles County has reported 100 cases of West Nile virus so far this year, the highest number recorded this early in mosquito season in nearly a decade, health officials said on Monday.

Five people have died, according to the Los Angeles County Department of Public Health.

The county is on track for one of its most severe West Nile virus seasons in recent years. The last time cases reached this level was in 2017, when 268 infections were reported over the entire season, according to the department.

Nearly all of this year's reported patients have suffered severe illness affecting the brain or spinal cord, and almost all required hospitalization, according to DPH. Officials said that is partly because milder cases often go undiagnosed and are not reported.

Cases have been reported throughout Los Angeles County.

“West Nile virus can cause serious illness, and the number of severe cases and deaths we are seeing this year is concerning,” Los Angeles County Health Officer Dr. Muntu Davis said.

Davis said the county remains in the peak transmission period and urged residents to use insect repellent, remove standing water and make sure windows and doors have screens without holes or tears.

West Nile virus is the most common mosquito-borne disease affecting Los Angeles County residents and is considered endemic to the region. Peak mosquito season typically lasts from June through November.

Local vector control agencies have increased surveillance, mosquito-control treatments and public outreach in response to elevated virus activity, San Gabriel Valley Mosquito and Vector Control District Manager Jason Farned said.

Residents can reduce their risk by using EPA-registered insect repellents containing ingredients such as DEET, picaridin, IR3535, 2-undecanone or oil of lemon eucalyptus. Wearing long sleeves and pants outdoors can also help prevent bites.

Health officials also recommend emptying standing water from flowerpots, birdbaths and other outdoor containers at least once a week. Pools and spas should be properly maintained, rain barrels and other water-storage containers should be covered and items that can collect water should be removed from yards.

West Nile virus is spread through the bites of infected mosquitoes, which acquire the virus after feeding on infected birds.

Most people who become infected do not develop symptoms. About 1 in 5 develops fever along with symptoms that can include headache, body aches, joint pain, vomiting, diarrhea or rash.

About 1 in 150 infected people develops severe illness, which can include high fever, stiff neck, confusion, muscle weakness or paralysis. People over 50 and those with underlying health problems face a greater risk of serious illness.

Symptoms generally develop three to 14 days after infection. Health officials advised anyone with severe symptoms to seek medical care immediately.

There is no specific treatment for West Nile virus disease and no vaccine to prevent infection.