From Sfgate · · 1m 20s
West Nile Cases Surge in California
El Niño weather fuels California's worst West Nile season in nine years.
In brief
El Niño weather fuels California's worst West Nile season in nine years. California reports 210 confirmed West Nile infections and 15 deaths this year as El Niño brings rain that boosts mosquito populations. Originally reported by Sfgate.
West Nile Cases Surge
California reports 210 confirmed West Nile infections and 15 deaths this year, the highest in nearly a decade.
El Niño Brings Rain
El Niño weather has brought humid conditions and rain to parts of California, refilling mosquito breeding sites.
Mosquito Population Surge
Culex mosquito numbers have risen sharply since recent rain, with increased activity from invasive Aedes aegypti mosquitoes.
Bird Infections Drive Spread
Infected birds with low immunity have increased mosquito transmission, as warmer weather allows faster virus replication.
Neuroinvasive Cases Rise
181 people have developed neuroinvasive West Nile infections this year, including one man who collapsed at Lassen Volcanic National Park.
Public Health Alert
Health officials warn of a surge in cases, with 64 new infections reported on Sept. 25 compared to 25 in the previous week.
El Niño's Impact
El Niño may bring mild winter temperatures that could boost mosquito activity and increase West Nile and dengue transmission risks.
Rain Could Help Control Mosquitoes
Heavy rain in Southern California might wash out mosquito breeding sites, reducing larvae populations before they hatch.
What matters most
California reports 210 confirmed West Nile infections and 15 deaths this year as El Niño brings rain that boosts mosquito populations.
