A coffee, a caffeinated drink and an energy soda proved a deadly combination for a South Carolina teenager who died within two hours of consuming them, triggering warnings about the risks of caffeine overdose.

Authorities in Sanaa, which is controlled by Shiite rebels, have declared a state of emergency in the Yemeni capital, where a deadly outbreak of cholera has spread rapidly.

The Huthi-run health ministry said it was "unable to contain this disaster" and appealed for international humanitarian assistance to deal with the crisis, in a statement released overnight.

An Ebola outbreak has been declared in northeast Democratic Republic of Congo, the World Health Organization said Friday, after the virus caused three deaths in the area since April 22.

In the battle against jihadists in northern Iraq, the village of Sayramun was recaptured in February but remains as isolated as ever and crucially still has no drinking water.

Thousands of babies died in Venezuela last year, new official data show, highlighting the tragic impact of the country's economic crisis as political tension heightened with deadly street clashes Wednesday.

The life expectancy of HIV-infected people in Europe and the United States has been boosted by a decade since anti-AIDS drugs became available in the mid-1990s, researchers said Thursday.

Thirty-four people have died of cholera-related causes and more than 2,000 have been taken ill in less than two weeks in Yemen, the World Health Organization said on Tuesday. 

On his to-do list for his trip to Istanbul, Palestinian tourist Jameel wants to visit the Blue Mosque and take a tour on the Bosphorus, like any other tourist. 

At least 570 suspected cases of cholera have surfaced in war-torn Yemen in the past three weeks, sparking fears of a potential epidemic, Doctors Without Borders said Sunday. 

Evidence suggests a mysterious illness that has killed 12 people in Liberia is linked to food or drink poisoning and is not a viral infection, the UN said Friday, confirming three new cases.

The World Health Organization said that as of Wednesday the number of patients had risen to 28, with the sickness still unexplained although Ebola and Lassa fever have been ruled out.