More than 200,000 suspected cases of cholera have been recorded in the country, WHO’s Yemen office said in a statement on Saturday.
A UN report has said children account for half of the registered cases to date, and about a quarter of the recorded fatalities.
Cholera is a highly contagious bacterial infection spread through contaminated food or water. It can be fatal within hours if left untreated.
Although the disease is easily treatable, doing so in conflict-torn Yemen has proved particularly difficult.
Two years of conflict have killed more than 10,000 people, wounded 45,000 others, and displaced more than 11 percent of the country’s 26 million people.
The United Nations has put the blame on all the warring sides and their international backers for the spread of cholera, which it calls a man-made humanitarian catastrophe.
“This is because of conflict, it’s man-made, it’s very severe, the numbers are absolutely staggering. It’s getting worse,” Stephen O’Brien, a senior UN humanitarian affairs official, said.
“The cholera element in addition to all the lack of food, the lack of medical supplies is, of course, primarily, one has to put that at the door of all parties to the conflict.”
On Friday, the humanitarian group Oxfam called for a ceasefire because of the outbreak, but the war shows no sign of letting up. Al Jazeera