312 suspected cases of diphtheria have been reported in Yemen between mid-August and 20 December. The outbreak has resulted in 35 deaths reported. At 11%, the case fatality rate (CFR) is high. 18 out of Yemen’s 22 governorates are affected, with Ibb having the majority of cases. Children aged 5-14 account for around 50% of suspected cases. About 90% of fatalities were reported in children aged less than 15.