Dead of a mosquito bite: L.A. records West Nile fatality as California cases hit 5-year high

Key Points:

• California is experiencing a surge in West Nile virus cases, reaching a five-year high with 30 human cases and three deaths reported statewide, driven by increased mosquito activity after a warm winter and early heat wave.
• Los Angeles County reported its first West Nile death of the year, with 15 infections recorded so far, about half occurring in the San Fernando Valley, prompting health officials to urge preventive measures such as using insect repellent and eliminating standing water.
• The early and widespread mosquito activity is linked to the warmest winter on record, with climate change expected to exacerbate the spread of mosquito-borne diseases as warmer temperatures allow pathogens and insects to migrate northward.
• Surveillance data shows a higher percentage of dead birds and mosquitoes testing positive for West Nile virus compared to the five-year average, indicating increased virus circulation in the environment.
• While most infected individuals show no symptoms, about 20% develop moderate illness and 1 in 150 experience severe neurological complications, with higher risk for older adults and those with certain health conditions; no vaccine or specific treatment is currently available.