PESQUISA VETERINÁRIA BRASILEIRA

Abstract in English:

ABSTRACT.- Coelho A.C., Pinto M.L., Coelho A.M. & Rodrigues J. 2009. [Comparison of two techniques of isolation of Mycobacterium avium subsp. paratuberculosis in faecal samples of ovine with clinical suspicion of paratuberculosis.] Comparação de duas técnicas de isolamento de Mycobacterium avium subsp. paratuberculosis em amostras de fezes de ovinos com suspeita clínica de paratuberculose. Pesquisa Veterinária Brasileira 29(5):415-420. Departamento de Ciências Veterinárias, Universidade de Trás-os-Montes e Alto Douro, Quinta de Prados, 5001-801 Vila Real, Portugal. E-mail: accoelho@utad.pt Paratuberculosis is a chronic enteric disease of ruminants caused by Mycobacterium avium subsp. paratuberculosis. Culture of bacteria from faeces and tissues samples constitutes one of the most effective methods of confirming the diagnosis of para-tuberculosis and the only method available to obtain strains of mycobacteria. However, this method is less sensitive and requires months of incubation before colony growth occurs. In this study, culture method was used on sheep faeces to diagnose paratuber-culosis in animals with compatible signs of the disease. A comparison of two culture media used to isolation was also investigated. Culture was positive in 2.0% of faecal samples. Isolation was obtained using Löwenstein Jensen® with mycobactin® J, and the Middlebrook® 7H11 with OADC®. The Löwenstein Jensen® with mycobactin® J was that provided highest amount of isolations. The percentages of isolation in each culture media were 2.0% (6/300) to Löwenstein Jensen® with micobactina J, and 1.0% (3/300) to Middlebrook® 7H11/OADC. The three positive samples in Middlebrook® 7H11/OADC were also positive in Löwenstein Jensen® with micobactina J. In the Middlebrook® 7H11/OADC alone there was no sample growth. The results of this study suggest that culture media of Löwenstein-Jensen® with micobactina® J is more effective for the isolation of sheep strains in Portugal.

• Paratuberculosis Mycobacterium avium subsp. paratuberculosis paratuberculose

Abstract in Portuguese:

ABSTRACT.- Coelho A.C., Pinto M.L., Coelho A.M. & Rodrigues J. 2009. [Comparison of two techniques of isolation of Mycobacterium avium subsp. paratuberculosis in faecal samples of ovine with clinical suspicion of paratuberculosis.] Comparação de duas técnicas de isolamento de Mycobacterium avium subsp. paratuberculosis em amostras de fezes de ovinos com suspeita clínica de paratuberculose. Pesquisa Veterinária Brasileira 29(5):415-420. Departamento de Ciências Veterinárias, Universidade de Trás-os-Montes e Alto Douro, Quinta de Prados, 5001-801 Vila Real, Portugal. E-mail: accoelho@utad.pt Paratuberculosis is a chronic enteric disease of ruminants caused by Mycobacterium avium subsp. paratuberculosis. Culture of bacteria from faeces and tissues samples constitutes one of the most effective methods of confirming the diagnosis of para-tuberculosis and the only method available to obtain strains of mycobacteria. However, this method is less sensitive and requires months of incubation before colony growth occurs. In this study, culture method was used on sheep faeces to diagnose paratuber-culosis in animals with compatible signs of the disease. A comparison of two culture media used to isolation was also investigated. Culture was positive in 2.0% of faecal samples. Isolation was obtained using Löwenstein Jensen® with mycobactin® J, and the Middlebrook® 7H11 with OADC®. The Löwenstein Jensen® with mycobactin® J was that provided highest amount of isolations. The percentages of isolation in each culture media were 2.0% (6/300) to Löwenstein Jensen® with micobactina J, and 1.0% (3/300) to Middlebrook® 7H11/OADC. The three positive samples in Middlebrook® 7H11/OADC were also positive in Löwenstein Jensen® with micobactina J. In the Middlebrook® 7H11/OADC alone there was no sample growth. The results of this study suggest that culture media of Löwenstein-Jensen® with micobactina® J is more effective for the isolation of sheep strains in Portugal.