Occurrence and hematological aspects of dogs with Canine Monocytic Ehrlichiosis

Abstract

Canine monocytic ehrlichiosis (CME) is an infectious disease caused by a gram-negative bacterium of the genus Ehrlichia spp., a monocyte parasite that leads to thrombocytopenia, anemia, hyporexia, apathy, pale mucous membranes, among others. The etiological agent is distributed worldwide, but there is a greater incidence and considerable prevalence in places with temperate climates due to the high presence of the tick vector Rhipicephalus sanguineus. In Brazil, the number of cases of this disease appears to have increased in many regions, due to several factors, but more studies are still needed regarding the prevalence in various regions. In view of the aforementioned points, this retrospective study aimed to address the findings of the clinical and laboratory evaluation of 43 medical records with the definitive diagnosis of canine monocytic ehrlichiosis, in naturally infected dogs, treated at HOVET - UFES, during the period of June 2017 to September 2023, in order to discuss and relate the findings found with current literature, as well as report the occurrence of this disease. For this, we used the clinical and laboratory records of dogs that showed positivity in the SNAP 4Dx Plus® rapid test and/or in blood smears, and presented Ehrlichia spp. morulae. in leukocytes. Simultaneously, clinical data, blood count findings and biochemical test results were prepared in figures, tables and organizational charts. Subsequently, with the information and results found, descriptive analysis of the data was used to demonstrate the occurrence through percentages. The most frequent clinical and laboratory changes were the presence of ticks, hyporexia, lymphadenomgelia, apathy, pale mucous membranes, thrombocytopenia, normocytic normochromic anemia, lymphopenia and hypoalbuminemia. Therefore, it is concluded that it is essential to report the occurrence of Ehrlichia sp. in dogs, as well as knowing the main clinical and laboratory changes mentioned so that it is possible to assist in the early identification of canine monocytic ehrlichiosis.