Emergence of Neisseria meningitidis serogroup X in the 2017/2018 Cerebrospinal Meningitis outbreak, Nigeria. (December 2020) - Amaza, R.; Popoola, M.; Ekeng, E.; Antonio, M.; Okoi, C.B.; Ameh, C.; Balogun, M.S.; Nguku, P.; Aderinola, O.; Adebayo, A.; Mba, N.; Ihekweazu, C.