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- W1968888001 abstract "Brucella abortus strain RB51, a rough mutant of the B. abortus 2308 virulent strain, was recently approved in the United States as the official vaccine for brucellosis in cattle. Following recent evidence of unauthorized use of RB51 vaccine in Italy, where the use of vaccines for brucellosis is no longer allowed, the suitability of an RB51-specific polymerase chain reaction assay for identifying the RB51 strain among Brucella field isolates from cattle in Italy was investigated. The oligonucleotide primers used in this study, belonging to a six-primer cocktail for Brucella species previously described by other authors, allowed the amplification of a 364-base pair (bp) fragment specific for RB51 and its parent strain 2308, and a 498-bp product specific for B. abortus. In addition, unresolved bands ranging from 600 to 700 bp were observed from RB51 strain. Brucella abortus biovars 1, 2 and 4 have only one specific sensitive 498-bp band. The B. abortus biovars 3, 5 and 6 did not give any signal. The 498-bp product from a reference Brucella strain was sequenced and submitted to EMBL with the accession number AJ271969 while the 364-bp fragment from RB51 strain was submitted to EMBL database with accession number AJ271968. The sequence studies confirmed the specificity of the detected fragments. No amplification was obtained by testing DNA from strains antigenically related to Brucella, such as Yersinia enterocolitica O:9, Escherichia coli O:157, Salmonella urbana and Pasteurella multocida. The results of this study indicate that this technique, in combination with specific serological tests, could be a useful diagnostic method to verify the use of RB51 vaccine and can contribute to the creation of a databank of circulating strains." @default.
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- W1968888001 date "2001-03-02" @default.
- W1968888001 modified "2023-10-14" @default.
- W1968888001 title "Use of Polymerase Chain Reaction to Identify Brucella abortus Strain RB51 among Brucella Field Isolates from Cattle in Italy" @default.
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- W1968888001 doi "https://doi.org/10.1046/j.1439-0450.2001.00432.x" @default.
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