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