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The aim of the present study was to detect Cercopithifilaria bainae and other tick-borne pathogens and to perform molecular characterization of the tick Rhipicephalus sanguineus s.l. collected from dogs. Ticks (n = 432, including 8 larvae, 59 nymphs, and 365 adults) were sampled from domiciled dogs (n = 73) living in Campo Grande, Mato Grosso do Sul (Midwest Brazil). All ticks were morphologically identified as R. sanguineus. Genomic DNA was extracted in pools (three to five ticks per animal) and was used for definition of R. sanguineus haplotypes (based on 16S rRNA analysis) and pathogen identification (Cercopithifilaria sp., Ehrlichia canis, Anaplasma platys, Hepatozoon canis, Babesia vogeli and Rickettsia spp.). Rhipicephal us sanguineus specimens were identified as haplotypes A and B. DNA of Cercopithifilaria bainae (43.83%; 32/73), Ehrlichia canis (24.65%; 18/73), Anaplasma platys (19.17%; 14/73), and Hepatozoon canis (5.47%; 4/73) was detected. The identity of pathogens was confirmed by DNA sequence analysis. The present study confirms the presence of haplotypes A and B of R. sanguineus in the state of Mato Grosso do Sul and its importance as a vector of several pathogens of veterinary concern. Finally, this is the first report to identify C. bainae in ticks in the Midwestern region of Brazil.

Molecular detection of Cercopithifilaria bainae and other tick-borne pathogens in Rhipicephalus sanguineus s.l. isolated from dogs in Midwest Brazil