Scientists begin work on a "ready-to-use vaccine" to help protect pregnant women from the Zika virus.Read more
Zika virus outbreak
Katie Falkenberg's photo feature on mothers caring for children damaged by the Zika virus in Brazil was a Pulitzer Prize finalist in 2017.
Doctors treating children whose mothers were infected with Zika say microcephaly is not the only problem.
The BBC's Tulip Mazumdar takes a look ahead to what will be some of the key health-related stories in 2017.
El Niño is a warming of the Pacific Ocean which has a major impact on weather around the world. The phenomenon tends to increase global temperature by releasing heat from the ocean to the atmosphere. The El Niño that occurred between 2015 and 2016 was one of the strongest on record. But a new study says that the last El Niño may have contributed to the spread of the Zika virus across South America, North America, Europe and Asia. Zika is a mosquito-borne disease suspected of causing microcephaly, a condition which results in abnormally small heads in babies. Professor Matthew Baylis of the University of Liverpool is one of the lead researchers from the study. (Photo: A mother feeds a baby with microcephaly in Brazil. Credit: Luis Robayo/AFP/Getty Images)