Comparison of three decontamination methods for Mycobacterium bovis isolation
Open Access
- 1 June 2008
- journal article
- Published by FapUNIFESP (SciELO) in Brazilian Journal of Microbiology
- Vol. 39 (2) , 241-244
- https://doi.org/10.1590/S1517-83822008000200008
Abstract
Sixty samples of tissue fragments with lesions suggestive of tuberculosis from bovine abattoirs, kept in saturated solution of sodium borate, were subjected to four treatments: 4% NaOH (Petroff Method), 12 % H2SO4 and 1.5% HPC (1-Hexadecylpyridinium Chloride) decontamination, and physiological saline solution (control). The HPC method showed the lowest contamination rate (3%) when compared to control (88%, p<0.001), NaOH (33%, p<0.001) and H2SO4 (21.7%, p<0.002). Regarding the isolation success, the HPC method was better (40%) than the control (3%, p<0.001), NaOH (13%, p=0.001) and H2SO4 (1.7%, p<0.001) methods. These results indicate that HPC is an alternative to the Petroff method.Sessenta amostras de fragmentos de tecidos com lesões sugestivas de tuberculose provenientes de abatedouros bovinos, conservadas em solução saturada de borato de sódio, foram submetidas a quatro tratamentos: descontaminação através dos métodos NaOH 4% (Método Petroff), H2SO4 12% e HPC (Cloreto de hexadecilpiridínio) 1,5%, e solução salina (controle). O método HPC apresentou a menor proporção de contaminação (3%), em relação ao controle (88%, p<0,001), NaOH (33%, p<0,001) e H2SO4 (21,7%, p=0,002). Em relação ao sucesso no isolamento, o método HPC apresentou o melhor resultado (40%), em relação ao controle (3%, p<0,001), NaOH (13%, p=0,001) e H2SO4 (1,7%, p<0,001). Os resultados indicam que o HPC é uma alternativa à utilização do método Petroff.CNPKeywords
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