The Mapping of the Occurrence of Brucellosis in Man and in Domestic and Wild Animals

Thimm, Bernhard M.

doi:10.1007/978-3-642-81760-1_2

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“…causing bovine brucellosis were characterized using both phenotypic and genotypic methods. While B. abortus biovar 1 have been reported as the most encountered in cattle worldwide (Corbel, 1997 ), in the USA (Bricker et al, 2003 ), and in Latin America (Acha and Szyfres, 2003 ; Lucero et al, 2008 ; Minharro et al, 2013 ), B. abortus biovar 3 was predominant in both native cattle and buffalo from eastern Africa and China (Timm, 1982 ; Domenech et al, 1983 ). B. abortus biovar 3 was also identified as the most commonly isolated in cattle from West Africa and Sub-Saharan Africa (Sanogo et al, 2013a ; Bertu et al, 2015 ).…”

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confidence: 99%

Exploring the Diversity of Field Strains of Brucella abortus Biovar 3 Isolated in West Africa

et al. 2017

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Brucellosis is one of the most widespread bacterial zoonotic diseases in the world, affecting both humans and domestic and wild animals. Identification and biotyping of field strains of Brucella are of key importance for a better knowledge of the epidemiology of brucellosis, for identifying appropriate antigens, for managing disease outbreaks and for setting up efficient preventive and control programmes. Such data are required both at national and regional level to assess potential threats for public health. Highly discriminative genotyping methods such as the multiple locus variable number of tandem repeats analysis (MLVA) allow the comparison and assessment of genetic relatedness between field strains of Brucella within the same geographical area. In this study, MLVA biotyping data retrieved from the literature using a systematic review were compared using a clustering analysis and the Hunter-Gaston diversity index (HGDI). Thus, the analysis of the 42 MLVA genotyping results found in the literature on West Africa [i.e., from Ivory Coast (1), Niger (1), Nigeria (34), The Gambia (3), and Togo (3)] did not allow a complete assessment of the actual diversity among field strains of Brucella. However, it provided some preliminary indications on the co-existence of 25 distinct genotypes of Brucella abortus biovar 3 in this region with 19 genotypes from Nigeria, three from Togo and one from Ivory Coast, The Gambia, and Niger. The strong and urgent need for more sustainable molecular data on prevailing strains of Brucella in this sub-region of Africa and also on all susceptible species including humans is therefore highlighted. This remains a necessary stage to allow a comprehensive understanding of the relatedness between field strains of Brucella and the epidemiology of brucellosis within West Africa countries.

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