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Epidemiology and Health 2018;e2018058.
DOI: https://doi.org/10.4178/epih.e2018058    [Accepted] Published online November 28, 2018.
Emergence of Neisseria meningitidis W-135 in Cote d’Ivoire: a laboratory based-surveillance
Man-Koumba Soumahoro1  , Clarisse Kouamé-Elogne2  , Jean-Claude Anné2  , Soualihou Noufé3  , Kouakou Christophe N’Guessan4  , Adèle Kacou-N’Douba5  , Thomas Hanslik6,7  , Mireille Dosso2 
1Institut Pasteur de Côte d'Ivoire, Département Epidémiologie-Recherche Clinique, Abidjan, Republic of Cote d'lvoire
2Institut Pasteur de Côte d’Ivoire ; Département Bactériologie Virologie , Abidjan, Republic of Cote d'lvoire
3Institut National de l’Hygiène Publique, Abidjan, Republic of Cote d'lvoire
4Institut National de la Sante Publique, Abidjan, Republic of Cote d'lvoire
5Université Félix Houphouet Boigny, UFR Sciences Médicales, Abidjan, Republic of Cote d'lvoire
6Université de Versailles-Saint-Quentin, F78180 Montigny-le-Bretonneux, France
7AP-HP, hôpital Ambroise Paré, service de médecine interne, F92100, Boulogne Billancourt, France
Correspondence  Man-Koumba Soumahoro ,Tel: +22522432672, Fax: +22522432672, Email: mksoumahoro@pasteur.ci
Received: August 27, 2018  Accepted after revision: November 28, 2018
Abstract
Objectives:
To describe the emergence of Neisseria meningitidis (Nm) W-135 and its characteristics compared to NmA.
Method:
Data on Neisseria meningitidis strains isolated in the National Reference Center of meningitis of Côte d'Ivoire between 2007 and 2012 were analyzed. Socio-demographic data and biological information’s of the samples were extracted from the database. Qualitative variables, like gender or the serotype of the bacteria, were compared with the Fisher's exact test and distribution of quantitative variables, like age, with the Wilcoxon test.
Results:
Among the 175 Nm strains, there were 57 NmA, 4 NmB, 13 NmC and 99 NmW-135. The geographical distribution of NmA and NmW135 strains was independent of age and gender. NmW135 was more common than NmA in the northern health districts of Cote d’Ivoire (85.9% vs. 45.5%; p < 0.001). No strain of NmA has been isolated since 2009, while 95% of the type W135 strains were isolated between 2010 and 2012.
Conclusions:
This study highlighted the emergence of meningococcus W135 in Côte d'Ivoire, as well as the simultaneous disappearance of NmA. It’s important to improve laboratory-based surveillance of Neisseria meningitidis to assess the trend of the bacteria circulation and to detect earlier the emergence of new serogroups.
Keywords: Meningitis, Bacterial; Neisseria meningitidis; Public Health Surveillance; Cote d'Ivoire
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