1. Bovine tuberculosis: diagnosis in dairy cattle through the association of analyzes
- Author
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Ezequiel Davi dos Santos, Elci Lotar Dickel, Leonardo Luiz Dametto, and Luciana Ruschel dos Santos
- Subjects
Pathology ,medicine.medical_specialty ,Tuberculosis ,040301 veterinary sciences ,Veterinary medicine ,diagnostic ,Caseous necrosis ,Physical examination ,0403 veterinary science ,Mycobacterium tuberculosis ,SF600-1100 ,medicine ,Dairy cattle ,General Veterinary ,biology ,medicine.diagnostic_test ,business.industry ,dairy cattle ,0402 animal and dairy science ,Outbreak ,Brucellosis ,Bovine ,Mycobacterium spp ,04 agricultural and veterinary sciences ,zoonosis ,biology.organism_classification ,medicine.disease ,040201 dairy & animal science ,tuberculosis ,cattle ,Histopathology ,bacterioses ,business - Abstract
Tuberculosis is a chronic anthropozoonosis of worldwide occurrence, caused by the bacterium Mycobacterium tuberculosis and its variants. In Brazil, the National Program for the Control and Eradication of Brucellosis and Tuberculosis in cattle, is responsible for diagnosing and the correctly allocate positive animals, but there is still a lack of definitive diagnosis of the disease. This study described the use of five diagnostic tools that can be used, preferably together, for the confirmation of suspected cases. These tools included the clinical examination comparative cervical tuberculin test, macroscopic findings during the slaughtering and histopathology of the damaged tissues followed by histochemistry. We evaluated a total of 211 dairy cattle, where 15.1% (32/211) had classic clinical signs of bovine tuberculosis, 74 (35%) showed reactivity in the comparative cervical tuberculin test. Of the total number of animals, 141 (66.8%) were referred for sanitary slaughter due to legal and control issues in the outbreaks of the disease. In the follow-up of slaughtering and inspection of viscera and carcasses, 74 (52.5%) had macroscopic lesions compatible with bovine tuberculosis, while 67 (47.5%) showed no visible changes. During the inspection, fragments of lymph nodes and liver and lung parenchyma were collected from five cattle with macroscopic lesions and five with no lesions. The histopathological analysis showed numerous areas of caseous necrosis with or without central calcification and granulomatous inflammatory infiltrate. In the special staining of Ziehl-Neelsen, numerous acid-fast bacilli were evidenced in all cases.
- Published
- 2020
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