LA County Reports This Year's First West Nile Infected Mosquito

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Where it was found: The infected mosquitoes were captured in a trap in the San Fernando Valley community of Winnetka, according to The Greater Los Angeles County Vector Control District (GLACVCD). That means the virus is currently active in the area’s mosquito populations.

“While the presence of West Nile Virus in our community is not unusual, this early detection serves as a critical reminder for all residents to take preventative actions,” Steve Vetrone, GLACVCD Director of Scientific-Technical Services, said in a statement. “We urge everyone to protect themselves from mosquito bites and to eliminate standing water around their homes where mosquitoes can breed.”

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The West Nile virus is spread through bird populations, and it is transmitted to humans through infected Culex mosquito bites. These mosquitoes are most active during dusk and dawn.

The backstory: The virus was first reported in the U.S. in 1999, growing to nearly 60,000 cases since, according to the Centers for Disease Control and Prevention (CDC).

Most people who become infected are unaware. One out of five people develop a fever and other minor symptoms, and about 1 out of 150 cases result in serious illness, according to the CDC.

It may take up to two weeks for someone to develop symptoms of the disease from the initial infection. Symptoms include headaches, weakness, gastrointestinal issues, and a rash. It can lead to meningitis in some cases and even death.

How to stay safe: The virus is endemic to L.A. and the lower 48 states, which means it reappears yearly during the summer mosquito season.

There is no vaccine for the West Nile virus. Angelenos are encouraged to be proactive and use preventive measures to protect themselves from mosquito bites.

The CDC recommends using insect repellents that contain the active ingredients of either DEET, Picaridin, IR3535, or Oil of Lemon Eucalyptus.

Tips on mosquito control:

• Eliminate standing water in clogged rain gutters, rain barrels, discarded tires, buckets, watering troughs or anything else that holds water for over a week.
• Ensure that swimming pools, spas, and ponds are properly maintained.
• Change the water in pet dishes, bird baths, and other small containers weekly.
• Request mosquitofish from your local vector control district for placement in ornamental ponds.
• Report neglected (green) swimming pools in your neighborhood to your vector control district.