Health ❯ Public Health ❯ Epidemiology ❯ Disease Surveillance

Human Cases

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

Contact tracing and additional CDC testing are underway in Washington.

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