Lien vers Pubmed [PMID] – 30663864
Lien DOI – 10.1002/vms3.140
Vet Med Sci 2019 May; 5(2): 243-248
Ehrlichiosis are severe, feverish tick-borne illnesses caused by specific species within the genus Ehrlichia (Anaplasmataceae family). Recent data suggest that ruminants in Corsica area reservoir for several Anaplasmataceae species. The purpose of our study was to determine whether Ehrlichia species could be detected in ticks collected in Corsican ruminants by using molecular methods. Ticks were collected in northern Corsica: (i) in May 2016 from sheep bred in one farm located in a 5000-inhabitants village and (ii) from cattle in June and July 2016 in a slaughterhouse. There sheep and cattle whole skin was inspected and ticks were collected manually. A total of 647 ticks was collected in northern Corsica during this study: 556 (86%) belonged to the Rhipicephalus bursa species and 91 (14%) to Hyalomma marginatum. The 91 H. marginatum ticks were organized in 27 pools, of which one (3.7%) was found positive for the presence of E. minasensis; this pool consisted of six ticks collected from a cow bred and raised northwestern Corsica. Ehrlichial DNA was not detected in R. bursa ticks. The 16S rRNA and groEL gene sequences of Ehrlichia detected in the H. marginatum pool showed 100% (303/303 bp) and 99.8% (555/556) of nucleotide identity with E. minasensis, respectively. Phylogenetic analyses demonstrated the highest closeness with E. minasensis UFMG-EV genotype than to any other E. canis strains. To our knowledge, this is the first report of E. minasensis outside of Brazil, Ethiopia and Canada. This identification of E. minasensis in H. marginatum merits to be further investigated and pleads for translational studies addressing the potential impact of vector-borne diseases of human and veterinary impact through large-scale research and surveillance programmes in Corsica.