Health ❯ Public Health ❯ Epidemiology ❯ Disease Surveillance

Human Cases

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

Health officials say elevated mosquito activity will keep infection risk high until the first hard frost.

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

First U.S. Death from H5N1 Bird Flu Raises Concerns Over Pandemic Preparedness

California Declares Emergency Over Bird Flu Outbreak in Dairy Farms

Concerns Grow as Bird Flu Spreads to New Species in California and Oregon

Canada Reports First Human Avian Flu Case in B.C. Teen

First Human Avian Flu Case Reported in Canada

Bird Flu Outbreak in U.S. Dairy Farms Raises Concerns

Missouri Reports First US Bird Flu Case Without Animal Contact