A diphtheria outbreak has killed 91 people in war-torn Yemen since late October, according to the World Health Organization (WHO) on Saturday.
In a statement, the UN agency said some 1,725 suspected cases of diphtheria have been registered in 20 of Yemen's 23 provinces, Anadolu Agency reported.
It listed Ibb and al-Hodeidah provinces in central and western Yemen as the hardest-hit by the disease.
Diphtheria spreads as easily as the common cold through sneezing, coughing or even talking, according to health officials.
Mainly affecting children, diphtheria can cause devastating epidemics if left unchecked.
Yemen has been racked by violence since 2014, when Houthi movement overran much of the country. The conflict escalated in 2015 when Saudi Arabia and its allies launched a devastating air campaign aimed at rolling back Houthi gains.
The ongoing violence has devastated basic services, including water and sanitation systems, prompting the UN to describe the situation in Yemen as one of "the world's worst humanitarian disasters in modern times."