The five states are Zamfara, Sokoto, Kebbi, Katsina and Niger, while 16 other states have recorded at least one case each of the disease.
The acting Director General of the NPHCDA, Dr. Emmanuel Odu, said these yesterday while briefing the Senate Committee on Primary Healthcare and Communicable Diseases on efforts being made to contain the outbreak, where he added that each vaccine costs between $30 and $50.