World Health Organization

A new report shows tuberculosis was one of the top 10 causes of death worldwide in 2015, and that the United Nations health body is not on track to meet its goals for reducing deaths from the disease.

Health care workers are anxious that Zika is spreading across the country undetected — and worry that the system is ill-equipped to deal with severe birth defects.

The World Health Organization released new treatment guidelines that acknowledge an entire class of antibiotics is now all but useless against the sexually transmitted disease.

Conjoined twin boys Moaz and Nawras have been evacuated out of one of Syria's most embattled areas for urgent medical treatment, following an international appeal to save their lives.

Dr. Margaret Chan, head of the World Health Organization, offered congratulations for victories on the health front — and words of serious concern about the future.

An epidemiologist says the island has been lucky so far, but needs to stop the virus at its source — where mosquitoes breed.

For the first time since the most recent Ebola outbreak began, Liberia, Guinea and Sierra Leone have each reported zero cases of Ebola for 42 days in a row. But the risk of small flare-ups remains.

What will be the big stories of 2016? Four experts offer their best guesses. They worry about Zika virus and malaria. But not all their predictions are downers.