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Rhipicephalus sanguineus  sensu lato (s.l.) is one of the most widespread ixodid ticks and is a competent vector of several vector-borne pathogens of veterinary and medical concern. For instance, this tick species transmits nematodes of the genus  Cercopithifilaria  and protozoa of the genus  Hepatozoon  to carnivores, including dogs. Here we investigated the occurrence of  Cercopithifilaria  spp. and  Hepatozoon  spp. in a population of ticks collected from naturally infested dogs living in rural areas of Northeastern Brazil. From August 2016 to June 2017, 758 tick specimens (mean ticks per month = 68.9 ± 71.4) were sampled from 75 dogs (mean ticks per dog = 10.11 ± 5.2) and dissected under a stereomicroscope in order to visualize  Cercopithifilaria  spp. larvae and  Hepatozoon  spp. oocysts and sporocysts.  R. sanguineus  s.l. was the only species collected, peaking in September (n = 273) and decreasing in February 2017 (n = 39). Different larval stages of  Cercopithifilaria bainae  were identified in 7 out of 758 (0.93%) ticks. In addition, 4 specimens (0.53%) were positive for oocysts and free sporocysts of  Hepatozoon canis . The identity of both species of parasites was molecularly confirmed. These results account for the predominance of  R. sanguineus  (s.l.) in domestic dogs from rural locations of the study area, as well as for the presence  C. bainae  and  H. canis  in these tick populations.

Screening of Cercopithifilaria bainae and Hepatozoon canis in ticks collected from dogs of Northeastern Brazil