Tick-borne pathogens in dogs, wild small mammals and their ectoparasites in the semi-arid Caatinga biome, northeastern Brazil
| Autor: | Ivo Wesley Gomes da Silva, Maria Carolina de Azevedo Serpa, Luciano Nakazato, Anna Maria da Cruz Ferreira Evaristo, Valéria Dutra, Daniel Moura de Aguiar, Glauber Meneses Barboza de Oliveira, Amanda Noéli da Silva Campos, Mauricio Claudio Horta, Marcelo Bahia Labruna |
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| Rok vydání: | 2020 |
| Předmět: |
0301 basic medicine
Male Nymph Ixodidae Ehrlichia canis Rhipicephalus sanguineus 030231 tropical medicine Zoology Rodentia CARRAPATOS Microbiology Rodent Diseases 03 medical and health sciences 0302 clinical medicine Dogs Seroepidemiologic Studies Prevalence Animals Dog Diseases Rickettsia Canidae biology Ehrlichia Felis Ehrlichiosis Rickettsia Infections Rickettsia rickettsii biology.organism_classification Coxiella burnetii Haemaphysalis Rickettsia felis 030104 developmental biology Infectious Diseases Marsupialia Insect Science Larva Parasitology Argasidae Female Q Fever Brazil |
| Zdroj: | Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) Universidade de São Paulo (USP) instacron:USP |
| Popis: | Caatinga is a biome exclusive to the semiarid zone of Brazil, where studies on ticks and tick-borne diseases are scarce. Herein, we investigated the occurrence of Rickettsia, Ehrlichia, and Coxiella in wild mammals, domestic dogs and their ectoparasites using molecular and serological techniques. During 2014-2016, blood samples and ectoparasites were collected from 70 small mammals (51 rodents, 18 marsupials, 1 wild canid) and 147 domestic dogs in three areas of the Caatinga. Through serological analyses of domestic dogs of the three areas, 8 to 11 % were seropositive for Rickettsia rickettsii, 9 to 37 % for Rickettsia amblyommatis, 61 to 75 % for Ehrlichia canis, and 0-5% for Coxiella burnetii. All wild mammals were seronegative for Rickettsia spp. and C. burnetii, except for one rodent (Wiedomys pyrrhorhinos) and one marsupial (Didelphis albiventris) that were seroreactive to C. burnetii, one wild canid (Cerdocyon thous) for R. amblyommatis, and two Rattus rattus for Rickettsia spp. Through PCR targeting DNA of Rickettsia, Ehrlichia or Coxiella, all blood samples were negative, except for the presence of Ehrlichia canis DNA in 8.8 % of the domestic dogs, and a recently reported novel agent, Ehrlichia sp. strain Natal, in one marsupial (Gracilinanus agilis). A total of 222 ticks, 84 fleas, and six lice were collected. Ticks were mostly Rhipicephalus sanguineus sensu lato, some Ixodes loricatus, Ornithodoros rietcorreai, Haemaphysalis sp., and Amblyomma spp.; fleas were Ctenocephalides felis felis, Pulex sp. and Polygenis (Polygenis) bohlsi jordani; and lice were Polyplax sp. and Gyropus sp. Through molecular detection of microorganisms, 9% of C. felis felis contained Rickettsia felis, 20 % of A. auricularium contained R. amblyommatis and 13 % of A. parvum contained 'Candidatus Rickettsia andeanae', whereas Ehrlichia canis DNA was detected in at least 6% of the R. sanguineus s.l. from one area. We report a variety of ectoparasites infesting small mammals and domestic dogs in the Caatinga biome, where these ectoparasites probably act as vectors of rickettsiae, ehrlichial agents (E. canis and Ehrlichia sp. strain Natal) and C. burnetii. Our results highlight to the potential risks of human infection by these tick-borne agents in the Caatinga biome. |
| Databáze: | OpenAIRE |
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