A Welsh health policy provided a rare opportunity for researchers to examine the vaccine's real-life impact on dementia risk.

Even though the virus was first discovered in laboratory monkeys in 1958, the original source came from a squirrel.

With measles cases now reported in six U.S. states, a Cleveland Clinic infectious disease doctor discusses general risks and ...

On a quiet summer day in 1978, then-40-year-old medical photographer Janet Parker came down with chicken pox, or so she thought. Within nine days, Mrs. Parker was admitted to the hospital, being too ...