aMeningitis and Vaccine Preventable Diseases Branch, Division of Bacterial Diseases, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, 1600 Clifton Rd NE, MS D-11, Atlanta, GA 30329, United States
bDivision for Infection Control and Environmental Health, Norwegian Institute of Public Health, Oslo, Norway
cDepartment of Community Medicine and Global Health, Faculty of Medicine, University of Oslo, Oslo, Norway
dInstitut Pasteur, Invasive Bacterial Infections Unit and WHO Collaborating Centre for Meningitis, Paris, France
eCentre Hospitalier Universitaire Pédiatrique Charles de Gaulle, Ouagadougou 01, Burkina Faso
fCentre de Recherche Médicale et Sanitaire, CERMES, Niamey, Niger
gCentre de Support en Santé International, N'Djamena, Chad
hAgence de Médecine Préventive, Paris, France
iInstitut National de Recherche en Santé Publique, Bamako 00223, Mali
⁎Corresponding author. gqe8@cdc.gov