World Health Organization says more than 100,000 Yemenis have caught cholera, according to BBC on Thursday.
A total of 798 deaths associated with the disease have been recorded in 19 out of 22 provinces since 27 April.
The charity Oxfam said the epidemic was killing one person almost every hour.
After two years of war between government forces and the rebel Houthi movement,the country's health, water and sanitation systems are collapsing.
Cholera is an acute diarrhoeal infection caused by ingestion of food or water contaminated with the bacterium Vibrio cholera.
Most of those infected will have no or mild symptoms but, in severe cases, the disease can kill within hours if left untreated.