Epidemiology

The South Carolina measles outbreak has triggered rare but serious brain swelling in some children

Fewer people under age 50 are dying from cancer in the U.S., but colorectal cancer mortality rates continue to surge

The U.S. has held its measles-free status for more than 25 years. Experts say unrelenting outbreaks in the past year may change that

The brutal respiratory infection has infected tens of thousands and killed at least 13 people in the U.S. in 2025

A novel influenza variant called subclade K appears to be driving an uptick in cases and hospitalizations throughout the U.S. and other countries

The Black Death ravaged Europe, and scientists and historians are still working to understand how it became so deadly

H5N1 bird flu has been circulating in U.S. wildlife since late 2021 but has caused only one human fatality. Now a different type of bird flu has also caused a death

U.S. flu rates remain low, but experts are keeping an eye on a new strain that’s been linked to unexpectedly early and severe seasons in several other countries

Canada lost its official measles elimination status after a year of continuous transmission

Limited COVID surveillance data are hampering vaccination and health strategies, researchers say

A meeting of the Pan American Health Organization this week will address the resurgence of measles in the Americas

Experiments suggests H9N2 has adapted to human cells, but cases of person-to-person transmission haven’t been reported yet