Epizootic Infection by Trypanosoma vivax in Cattle from the State of Minas Gerais, Brazil

• Published in: Korean journal of parasitology 2019, Hosts and Diseases, 57(2), , pp.191-195
• Main Authors: Reis, Matheus de Oliveira, Souza, Fernanda Rezende, Albuquerque, Adriana Silva, Monteiro, Fernanda, Oliveira, Luan Francisco Dos Santos, Raymundo, Djeison Lutier, Wouters, Flademir, Wouters, Angélica Terezinha Barth, Peconick, Ana Paula, Varaschin, Mary Suzan
• Format: Article
• Language: English
• Subjects: Animal Structures - parasitology; Animal Structures - pathology; Animals; Blood - parasitology; Brazil - epidemiology; Brief Communication; Cattle; Cattle Diseases - epidemiology; Cattle Diseases - parasitology; Cattle Diseases - pathology; Microscopy; Polymerase Chain Reaction; Trypanosoma vivax - isolation & purification; Trypanosomiasis, African - epidemiology; Trypanosomiasis, African - parasitology; Trypanosomiasis, African - pathology; Trypanosomiasis, African - veterinary; 예방의학
• ISSN: 0023-4001; 2982-5164; 1738-0006; 2982-6799
• DOI: 10.3347/kjp.2019.57.2.191

Trypanosomiasis is caused by a pathogenic protozoan of the genus Trypanosoma, being Trypanosoma vivax the most important agent for cattle. The aim of the present study was to demonstrate the expansion of T. vivax infection in different mesoregions of Minas Gerais, Brazil, and describe the clinicopathological findings of trypanosomiasis in cattle. The diagnosis was based on visualization of the parasite in blood smears and DNA detection of T. vivax in the blood of live cows and tissues of necropsied animals by the polymerase chain reaction (PCR). Thirty suspected herds were tested, of which 11 were positive for T. vivax. The most frequent clinical signs were anemia, apathy, drop in milk production, weight loss, reproductive disorders, and nervous signs. Concomitant diseases, such as malignant edema, pneumonia and increased cases of mastitis were associated with T. vivax infection. Three cows were necropsied and the most significant findings were low body condition score, pale mucous and spleen with white pulp hyperplasia. The results demonstrated the expansion of T. vivax infection in Minas Gerais, that PCR-associated blood smears are promising for diagnosis, and that other diseases often occur concomitantly to T. vivax infection in regions with trypanosomiasis in cattle.