Health: Beware Mosquitoes, Still a Threat Even During Fall

First week of autumn sees continued West Nile virus and mosquito activity
Published on Sep 22, 2022

A mosquito taking a blood meal. Some mosquitoes can spread West Nile virus when they bite.

Mosquitoes will continue to bite into pumpkin spice season as the official start to autumn begins September 22, advises the San Gabriel Valley Mosquito & Vector Control District (SGVMVCD).

“People are surprised mosquitoes are active in the fall,” said SGVMVCD Communications Director Levy Sun. “Keep the mosquito repellent nearby and continue tipping out stagnant water weekly.”

So far in 2022, SGVMVCD reported more than 130 mosquito samples and 5 dead birds that tested positive for West Nile virus in San Gabriel Valley. The native Culex mosquitoes spread West Nile virus to people after biting birds carrying the virus.

Invasive Aedes mosquitoes, also known as ankle biters, will likely continue to bite people aggressively. Historically, Aedes mosquitoes are most active from June to November. The presence of Aedes in Los Angeles County increases the risk of Zika, yellow fever, dengue, and chikungunya outbreaks. To date, there have only been travel cases.

Mosquito control staff will continue to monitor and control for mosquito-borne diseases. Residents share the responsibility of mosquito control by remaining bite-free and eliminating habitats, such as dense vegetation and stagnant water, that allow mosquitoes to grow and hide.

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