Communities hit by an Ebola outbreak face quarantine to try to halt the spread of the virus.

The man was in his 40's and had been quarantined in the megacity.

The teenager's condition is known as odontoma.

The doctor leading the fight against Ebola in Sierra Leone is now being treated for the deadly virus.

Part of a city in north-west China has been sealed off after a man died of bubonic plague, state media say.

Research suggests untouchable "viral reservoirs" form even before H.I.V. can be detected in the blood.

A report from the U.N. states that AIDS-related diseases are declining worldwide.

Grow-your-own pacemakers are a step closer to reality, after pioneering experiments in pigs.

New studies failed to show that niacin reduced the risk of heart disease and stroke.