The International Committee of the Red Cross (ICRC) says that the number of suspected cholera cases in conflict-ridden Yemen has reached 1 million.
The ICRC said on December 21 that the outbreak was "amplifying the suffering of a country caught up in a brutal war."
It added that more than 80 percent of Yemen’s population lack food, fuel, clean water, and access to health care.
More than 2,220 people are believed to have died of the disease since April.
Cholera is a diarrheal infection caused by the ingestion of food or water contaminated with the bacteria Vibrio cholera.
Yemen has been embroiled in a devastating conflict between the government of President Abd-Rabbu Mansur Hadi, supported by a Saudi-led coalition, and the Iran-backed Shi'ite Huthi rebels over the past three years.
According to the United Nations, the conflict has killed more than 8,670 people, mostly civilians.