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Year 2014 - Volume 34, Number 6
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Detection of Brucella abortus in bovine tissue using PCR and qPCR, 34(6):497-502
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ABSTRACT.- Caitano M.A.B., Soares C.O., Ramos C.A.N., Ferraz A.L.J., Sanches C.C. & Rosinha G.M.S. 2014. [Detection of Brucella abortus in bovine tissue using PCR and qPCR.] Detecção de Brucella abortus em tecidos bovinos utilizando ensaios de PCR e qPCR. Pesquisa Veterinária Brasileira 34(6):497-502. Faculdade de Medicina Veterinária e Zootecnia, Universidade Federal de Mato Grosso do Sul, Av. Felinto Müller 2443, Ipiranga, Campo Grande, MS 79070-900, Brazil. E-mail: gracia.rosinha@embrapa.br
The aim of the study was to evaluate the technical polymerase chain reaction (PCR) and Real-Time PCR (qPCR) to detect Brucella abortus from bovine tissues with suggestive lesions of brucellosis. For this, 21 fragments of bovine tissues collected at abattoirs of Mato Grosso do Sul were processed and subjected to microbiological culture and extraction of genomic DNA to perform the PCR reactions and qPCR. Eight samples of microbiological culture showed bacterial growth and five samples were confirmed as B. abortus by PCR. DNA of Brucella (IS711 primers) was detected in 13 (61.9%) directly from tissue samples and 17 (81%) from tissue homogenate samples. With the species-specific set of primers BruAb2_0168F and BruAb2_0168R, 14 (66%) tissue samples and 18 (85.7%) tissue homogenate samples were positive. Six positive samples in the species-specific PCR were sequenced and the best hit in the BLASTn analysis was B. abortus. By qPCR, 21 (100%) tissue samples and 19 (90.5%) tissue homogenate samples were positive for B. abortus. Ten samples of DNA from bovine blood from an accredited-free herd were used as negative control in PCR and qPCR analysis using the primers BruAb2_0168F and BruAb2_0168R, and no one amplified by PCR, whereas two samples were amplified by qPCR (20%). In conclusion, both techniques detect the presence of B. abortus directly from tissues and homogenized, but the qPCR showed high sensitivity. The results indicate that qPCR can represent an alternative tool for faster and more accurate detection of B. abortus directly from tissues, and use in health surveillance programs by presenting satisfactory sensitivity and specificity. |
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