By mid-January 2017, 80% of cases were located in 28 districts of Al-Dhale'a, Al-Hudaydah, Hajjah, Lahij and Taiz.
Sampai dengan pertengahan Januari tahun berikutnya, 80% kasus terdapat di 28 distrik di Al-Dhale'a, Al-Hudaydah, Hajjah, Lahij, dan Taiz.