A government report finds that laboratories in the U.S. that work with select agents such as Ebola and anthrax aren’t as secure as they should be.

Nearly four dozen people have died.

Researchers tone down their highly publicized study that reported the presence of deadly pathogens on New York City subways.

Researchers find Oriental rat fleas, the insects that can carry plague bacteria, on New York City-dwelling rodents.

Climate fluctuations in Central Asia may have been responsible for repeated European outbreaks of bubonic plague, a study suggests.

Ancient skeletons test positive for plague-causing bacteria.

The Yersinia pestis strain extracted from the bones of Black Death victims may no longer exist.