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L.A. had its worst mosquito year this decade. El Niño could make it even worse

California reported 528 serious illnesses and 32 deaths as warmer weather and heavy rain boosted mosquito breeding and virus transmission.

Summary by Palo Alto Online
This story was originally published by CalMatters. Sign up for their newsletters. When temperatures rise above 70 degrees, tiny West Nile viral particles begin to rapidly replicate in the gut of Culex mosquitoes, which then go hunting for their next “blood meal,” injecting virus-laden saliva into their prey when they feast. This year, California’s warm, […]

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L.A. had its worst mosquito year this decade. El Niño could make it even worse

L.A. County has more than half of the state’s 528 cases. Experts say extreme weather will bring more outbreak years.

·Sacramento, United States
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Cal Matters broke the news in Sacramento, United States on Monday, November 9, 2026.
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