López VG, Hernández AJ, Sierra LE

Language: English/Spanish
References: 11
Page: 235-239
PDF size: 371.02 Kb.

ABSTRACT

This study was undertaken to determine the frequency and distribution of cases of tuberculosis (TB) in cattle slaughtered for meat in abattoirs in Baja California, Mexico. The study was conducted in 5 abattoirs with federal- or municipal inspection and at the Laboratory of Tuberculosis and Bruceliosis at the Autonomous University of Baja California in Mexicali, Mexico. A tentative diagnosis of TB was established using histopathological methods. Based on histopathology, cases of TB (mycobacteriosis) were characterized by the presence of typical lesions (granuloma, central necrosis, mineralization, giant cells and the presence of acid-fast bacilli). The hypothesis test was used to determine whether the proportion of TB cases in dairy cattle was significantly greater than that in beef cattle. During the post mortem exam, 505 animals were condemned due to the presence of TB-like lesions; 248 (49%) cases were confirmed as TB positive ones based on histopathology. The proportion of TB cases in dairy cattle (2%) was significantly greater (P ‹ 0.05) than that in beef cattle (0.02%). Distribution of tuberculous lesions in both dairy- and beef cattle was more frequent in head lymph nodes.

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