West Nile Cases Surge Across California as El Niño LoomsWest Nile Surge Shows How a Warming Climate Raises Health RisksWest Nile’s Cycles and Weather Matter More Than Simple Forecasts
California recorded its highest West Nile activity in five years, with 528 serious illnesses and 32 deaths as of November 6. Los Angeles County accounted for more than half of the state’s reported human cases.California’s West Nile cases reached a five-year high, with 528 serious illnesses and 32 deaths by November 6. Experts warn that warmer conditions and a potentially rainy El Niño winter could help drive another outbreak.California saw its most West Nile activity in five years, but experts say bird immunity and shifting weather make next year’s outbreak difficult to predict. A possible El Niño could bring heavy rain and more mosquitoes.