Health ❯ Public Health ❯ Epidemiology ❯ Disease Surveillance

Human Cases

Early Multi-State Surge in West Nile Brings First Los Angeles Human Case

Unusually warm, wet weather has boosted mosquito survival, prompting expanded surveillance with targeted spraying to reduce human infections.

Washington Confirms First Human H5N5 Bird-Flu Case as CDC Maintains Low Public Risk

First Human West Nile Cases Confirmed in Massachusetts and Delaware County as Mosquito Positives Surge

Wisconsin, Texas and Toronto Report First West Nile Virus Human Cases of 2025