Tuberculosis Lesions Associated with the Production and Epidemiological Profiles of Cattle with Positive Intradermal Test
DOI:
https://doi.org/10.17921/1415-6938.2025v29n4p1023-1032Abstract
Bovine tuberculosis (BT) is an infectious disease caused by Mycobacterium bovis, characterized by nodular and granulomatous lesions in organs, lymph nodes and carcasses, leading to significant economic and sanitary losses in cattle production. The comparative cervical test (CCT) is the main method recommended by the World Organization for Animal Health (WOAH) for diagnosis. This study aimed to correlate the presence of characteristic BT lesions in the sanitary slaughter of 257 bovines from nine cities in Northern Paraná State (2021-2022) with the productive (management system and aptitude) and epidemiological (sex, age and origin) characteristics of the animals. Only 28% (71/257) of the CCT-positive animals had lesions, and 91% (64/71) of these were females over 36 months old. The correlations between the presence of lesions and age and sex were significant, indicating a higher prevalence of the disease in older females. Lesions were mainly in the head (97.1%), lung (69.1%), lung lymph nodes (69.1%), liver (50.7%), intestines (31.0%) and spleen (29.6%). There is no direct correlation between the animals' location and lesions' presence. Still, the distribution of these injuries suggests possible differences in the mechanisms of infection, the strains of M. bovis or the stages of the disease.
Keywords: Age. Aptitude. Sex. Management System. Origin.
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Copyright (c) 2025 Daiane Fernanda Ferreira, Sergio Tosi Cardim, Elis Lorenzetti, Bruna Cardoso Coelho Galafassi, Manuela Amanda Jorge, Elsa Helena Walter de Santana, Lina Casale Aragon-Alegro
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