Yellow Fever Mosquitoes in Castro Valley | San Francisco News

Yellow fever mosquitoes have arrived in Castro Valley, bringing serious health risks like dengue, Zika, and yellow fever. Detected in July, they’re being targeted with insecticide sprays to stop larvae from thriving. Fueled by recent humid weather and the looming El Niño, these tropical invaders are multiplying fast—especially since they’re perfectly adapted to warm, damp conditions. Compounding the threat, local mosquito populations carrying West Nile virus are also surging, creating a dangerous double whammy as heat accelerates disease transmission. Stay alert as summer heats up. Listen in comfort:Get a discount on a Soli Pillow: http://solipillow.com/discount/dnn. Advertise on DNN:[email protected] This is an automated, high-level news summary based on public reporting.Report issues to [email protected]. View sources & latest updates:https://sources.thednn.ai/a4ec7a7d21f7d565