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Front. Vet. Sci. | doi: 10.3389/fvets.2019.00164

Seroprevalence and current infections of canine vector-borne diseases in Costa Rica

 Andrea Springer1, Victor M. Montenegro2, Sabine Schicht1, Majda Globokar Vrohvec3, Nikola Pantchev3, Jörg Balzer3 and  Christina Strube1*
  • 1Institute for Parasitology, University of Veterinary Medicine Hannover, Germany
  • 2Parasitology Laboratory, School of Veterinary Medicine, National University of Costa Rica, Costa Rica
  • 3IDEXX Laboratories (Germany), Germany

Domestic dogs may carry several vector-borne pathogens, including zoonotic agents, especially in tropical regions like Central America. The epidemiology of these pathogens is prone to change due to urbanization, trade and travel as well as climate change, necessitating repeated monitoring. This study aims to present a comprehensive picture of canine vector-borne diseases in Costa Rica, combining data on seroprevalence with molecular species identification of the causative pathogens. In this survey, 294 dogs from all seven provinces of Costa Rica were included. After a clinical examination, diagnostic blood samples were analysed with regard to packed cell volume (PCV) and presence of microfilaria. Serum samples were tested for antibodies against Ehrlichia spp., Anaplasma spp., Babesia spp., Borrelia burgdorferi sensu lato (s.l.) as well as antigen of Dirofilaria immitis. Seropositive and microfilaremic blood samples were analysed by PCR to detect current infections and identify the pathogen species. Overall, 45.24% (133/294) of dogs were seropositive for at least one of the tested pathogens. Seroprevalence was highest for Ehrlichia spp. (39.46%, 116/294), followed by Babesia spp. (23.13%, 68/294), Anaplasma spp. (13.27%, 39/294) and B. burgdorferi s.l. (0.34%, 1/294). Generalized linear mixed models indicated a significant association of Ehrlichia-, Anaplasma- and Babesia-seropositivity, as well as a significant effect of age and breed on Ehrlichia-seropositivity. Furthermore, a statistically significant negative effect of Ehrlichia-, Anaplasma- and Babesia-seropositivity on PCV was found. Regarding current infections, Ehrlichia canis DNA was detected in 51.72% (60/116) of Ehrlichia-seropositive dogs, while Ehrlichia ewingii and Ehrlichia chaffeensis were not detected. Furthermore, 10.26% (4/39) of Anaplasma-seropositive dogs were coinfected with Anaplasma phagocytophilum and Anaplasma platys, while one animal (2.56%) was infected with A. phagocytophilum only. Among Babesia-seropositive dogs, Babesia vogeli and Hepatozoon canis were detected in one animal each (1.47%, 1/68). Dirofilaria immitis antigen was detected in 4.42% (13/294) of dogs. In microfilaremic animals, D. immitis as well as Acanthocheilonema reconditum infections were identified. This survey demonstrates that canine vector-borne pathogens, including zoonotic agents like A. phagocytophilum and D. immitis, are widespread in Costa Rica. Thus, protection of dogs from disease-transmitting vectors is recommended from an animal welfare as well as public health perspective.

Keywords: vector-borne diseases, Tick-Borne Diseases, Zoonoses, Rickettsia spp., Ehrlichia spp., Anaplasma spp., Babesia spp., Central America

Received: 04 Apr 2019; Accepted: 13 May 2019.

Edited by:

David Modrý, University of Veterinary and Pharmaceutical Sciences Brno, Czechia

Reviewed by:

Jan Slapeta, University of Sydney, Australia
Xiangye Liu, Xuzhou Medical University, China  

Copyright: © 2019 Springer, Montenegro, Schicht, Globokar Vrohvec, Pantchev, Balzer and Strube. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

* Correspondence: Prof. Christina Strube, Institute for Parasitology, University of Veterinary Medicine Hannover, Hanover, Lower Saxony, Germany,