At least 180 people died in Yemen in recent weeks due to cholera, the International Committee of the Red Cross (ICRC) said on Monday.
A state of emergency has been declared in the capital city Sanaa after the deadly disease broke out.
The UN said that an estimated 7.6 million people live in areas at high risk of cholera transmission in the war-torn country.
UN spokesman Stephane Dujarric told reporters that inadequate sanitation infrastructure has increased the risk.
“Inadequate sanitation infrastructure, coupled with displacement, overcrowded shelters and settlements, increase the risk of person-to-person cholera transmission," Dujarric said at a daily news briefing.
In response, the UN is supporting 33 diarrhea treatment centres in Yemen, and ten oral dehydration therapy centres have been opened, he said.
The UN has established two emergency centres, in Aden and Sana'a, with Rapid Response Teams to monitor and treat contaminated water sources, he added.
A statement issued by the World Health Organisation (WHO) said last Thursday that the cases were reported from 10 provinces, including the capital Sanaa.
The cholera outbreak in Yemen was announced by Yemen's Ministry of Public Health and Population on Oct. 6, 2016.
Yemen, the impoverished Arab country in the southern tip of the Arabian Peninsula, has been involved in a civil war since two years ago. The war pits Iranian-allied dominant Houthi movement, backed by forces loyal to former President Ali Abdullah Saleh, against their foe of Saudi-backed government of President Abd-Rabbo Mansour Hadi.
The war has killed more than 10,000 people, half of them civilians, and displaced over 2 millions, according to humanitarian agencies.