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Background  In West Africa, tick-borne relapsing fever is a neglected arthropod-borne infection caused by  Borrelia crocidurae  transmitted by the argasid tick  Ornithodoros sonrai . From an epidemiological point of view, it is of interest to know whether some genotypes of the vector are specialized in carrying certain genotypes of the pathogen.    Findings  Thirty-five  O. sonrai  ticks collected in Mali, Senegal, Mauritania and Morocco confirmed to be  B. crocidurae -infected ,  were genotyped by 16S rRNA gene sequencing.  B. crocidurae  was genotyped by Multispacer Sequence Typing. The 35  O. sonrai  ticks grouped into 12 genotypes with strong geographical structuration. MST resolved the 35  B. crocidurae  isolates into 29 genotypes with pairwise divergence of 0.09 - 1.56 % without strict geographical structuration as genotype ST22 was found in Mali, Senegal and Mauritania. There was no evidence of tick-borrelia specialization as one  O. sonrai  genotype carried several  B. crocidurae  genotypes and one  B. crocidurae  genotype was found in different  O. sonrai  genotypes.    Conclusions  This report illustrates a non-specialized circulation of  B. crocidurae  borreliae within  O. sonrai  ticks in West Africa.

Ubiquitous bacteria Borrelia crocidurae in Western African ticks Ornithodoros sonrai