Preprint Communication Version 1 Preserved in Portico This version is not peer-reviewed

Geographic Distribution of Ehrlichia Canis Genotypes in Brazil

Version 1 : Received: 28 September 2020 / Approved: 29 September 2020 / Online: 29 September 2020 (14:38:27 CEST)

How to cite: Taques, I.; Campos, A.; Kavazaki, M.; Almeida, S.; Aguiar, D. Geographic Distribution of Ehrlichia Canis Genotypes in Brazil. Preprints 2020, 2020090715 (doi: 10.20944/preprints202009.0715.v1). Taques, I.; Campos, A.; Kavazaki, M.; Almeida, S.; Aguiar, D. Geographic Distribution of Ehrlichia Canis Genotypes in Brazil. Preprints 2020, 2020090715 (doi: 10.20944/preprints202009.0715.v1).

Abstract

Tandem repeat proteins of 36 kDa (TRP36) are major immunoreactive proteins of Ehrlichia canis, which have been used in the serological diagnosis of different genotypes of the microorganism. The aim of this study was to evaluate the distribution of the American (USTRP36), Brazilian (BrTRP36) and Costa Rican (CRTRP36) genotypes of E. canis in Brazil, using ELISA assays. Serum samples of 815 dogs from 49 cities from all over Brazil were analyzed. Our results showed that 33.9% of the samples were reactive to the USTRP36 genotype and 32.6% to the BrTRP36 genotype. The two genotypes appeared to occur equally throughout Brazil, although the frequency of seropositivity was lower in the south than in the country’s other regions. Co-positivity for the American and Brazilian genotypes was also observed in 16% of samples. A few dogs (n=5; 0.6%) reactive to E. canis-TRP36 genotype (CRTRP36) were also detected in the northeast and southern regions. We conclude that the American and Brazilian genotypes of E. canis are distributed evenly in Brazil, especially in the tropical region, while the temperate region in the south presented the lowest prevalence values. This study offers the first report of dogs seropositive for the Costa Rican genotype in Brazil.

Subject Areas

dog; ehrlichiosis; ELISA; Tick-borne; TRP19; TRP36

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