On Sunday evening, the World Health Organization announced outbreaks of measles and polio in Yemen.
The UN agency said on its Twitter account: "Yemen is now witnessing an outbreak of measles and polio." More than 80% of children with measles have not been vaccinated, she said. The organization stressed that there is an urgent need for vaccination in Yemen, without further details.
According to government reports, there have been outbreaks of polio and measles, especially in the Houthi-controlled governorates of Saada and Hajjah in northwestern Yemen.
In recent days, the Yemeni government and rights groups have accused the Houthis of banning vaccines in the north of the country, which has caused a resurgence of diseases such as polio and measles.
The group has not officially commented on the accusations, but maintains that it suffers from severe shortages of medicines and medical supplies that are causing the spread of diseases in Yemen's most densely populated areas under its control.
Yemen is suffering from multiple crises due to a war that began after the Houthis took control of the capital, Sanaa, and several governorates in September 2014, and the conflict has escalated since March 2015, after a Saudi-led military coalition intervened to support the legitimate government forces, in the face of the Iran-backed Houthi group.