On the eve of its 6th polio-free anniversary, India immunizes over 170 million children, despite a lack of roads, reinfection threats, and a periodic mistrust of vaccines.

Scientists have found that sometimes people infected with measles later develop "immune amnesia": their bodies don't remember being sick, even with other viruses.

A Curious Reader asks: Am I really at a higher risk of getting sick on an airplane?

Lyme disease is seeing an upswing. But the-now widespread condition was not formally described until 1977, based on a case in Old Lyme, Connecticut.

A surprising examination of how armadillos spread leprosy.

Dr. Ian Crozier was declared cured after a harrowing bout with the Ebola virus, only to discover that his left eye was full of the virus.

The news of a recent outbreak at Disneyland in California brought measles back into the public view.

A is for don’t panic. The rest is science.

August 27th marked the birthday of Osamu Shimomura, the organic chemist who discovered green fluorescent protein in 1962. ...