1997, Number 3
Post mortem diagnosis in tuberculosis-like condemnations in cattle slaughtered in Baja California, Mexico
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ABSTRACTThis 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.
Corner, L.A., Melville, L., McCubbin, K., Small, K.J., McCormick, B.S., Wood, P.R. and Rothel, J.S.: Efficiency of inspection procedures for the detection of tuberculosis lesions in cattle. Austr. vet. J., 67:389-392 (1990).
Daniel, W.W.: Biostatistics: A Foundation for Analysis in the Health Sciences. 3rd ed. John Wiley & Sons, New York, 1983.
Hernandez-Anda de, J., Monahan, M., Collins, J.D., Brennan, P.J. and Salman, M.D.: Evaluation of MPB70, bovine PPD, and lipoarabinomannan as antigens in ELISA for the serodiagnosis of bovine tuberculosis. Prev. vet. Med., 27:211-215 (1996).
Kantor, I.N., Vega de la, E., Caballero, P.J. and Pinanez, D.: Estudio de órganos bovinos decomisados por tuberculosis en mataderos del Gran Buenos Aires. Rev. Med. Vet. B. Aires., 62: 282-286 (1981).
Kantor, I.N. and Ritacco, V.: Bovine tuberculosis in Latin America and the Canbbean: Current status, control and eradication programs. Vet. Microbiol., 40: 5-14 (1994).
Mcllroy, S.G., Neill, S.D. and McCraken, R.M.: Pulmonary lesions and Mycobacterium bovis excretion from respiratory tract of tuberculin reacting cattle. Vet. Rec., 118: 718-721 (1986).
Norma Oficial Mexicana (NOM-031-Z00-1995): Campaña Nacional Contra la Tuberculosis Bovina (Mycobacterium bovis). Diario Oficial 35-58 (8 de marzo de 1996).
Plackett, P., Ripper, J., Corner, L.A., Small, K., Witte de, K., Melville, L., Hides, S. and Wood, P.R.: An ELISA for detection of anergic tuberculous cattle. Austr. vet. J., 66: 15-19 (1989).
Renteria-Evangelista, T. and Hernandez-Anda de, J.: Tuberculosis in dairy calves: Risk of Mycobacferium spp exposure associated with management of colostrum and milk. Prev. vet. Med., 27: 23-27 (1996).
Ritacco, V., Lopez, V., Kantor, I.N., Barrera, L., Errico, F. and Nader, A: Reciprocal cellular and humoral immune responses in bovine tuberculosis. Res. vet. Sci., 50:365-367 (1991).
Soolingen van, D., Haas de, P.E.W., Haagsma, J., Eger, T., Hermans, P.W.M., Ritacco, V., Alito, A. and Embden van, J.D.A.: Use of various genetic markers in differentiation of Mycobacterium bovis strains from animals and humans and for studying epidemiology of bovine tuberculosis. J. Clin. Microbiol., 32:2425-2433 (1994).