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.
Article history Dirofilariosis is an emerging zoonosis with a wide distribution worldwide. In Brazil, it is caused by the nematode, Dirofilaria immitis, and transmitted by different species of culicide mosquitoes. The present work aimed to report the first case of canine dirofilariasis in the municipality of Campo Grande, Mato Grosso do Sul. On September 6, 2018, a 14-year-old female canine poodle with a history of traveling to the coastal region was seen at a private veterinary clinic in Campo Grande, with hypertension and eosinophilia. The animal was medicated with dipyrone and anlodipine for control of the hypertension and, after nine days, it returned with worsening of the clinical picture (êmese, melena, tacquicardia, tacquipnea). Complementary laboratory tests were requested, observing cardiac, hepatic, renal and pancreatic alterations, besides the presence of microfilaria, morphologically identified and confirmed as D. immitis by serological and molecular tests. The animal was hospitalized, but died on the fifth day after hospitalization. The fact that the animal has a report of a trip to the coastal region, without prophylactic treatment, characterizes the case as an allochthonous of dirofilariasis in the region.
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