Recurrent diphtheria outbreaks in Nigeria: A review of the underlying factors and remedies oleh Nasir Abdulrasheed, Lukman Lawal, Abdulazeez B. Mogaji, Ahmed O. Abdulkareem, Abdulrahman K. Shuaib, Sodiq G. Adeoti, Opeyemi P. Amosu, Abdulmujeeb O. Muhammad‐Olodo, Abdulwahab O. Lawal, Tawakalitu A. Jaji, Toufik Abdul‐Rahman