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Thirty-four Brucella reference or field strains representing all the species and biovars were studied by repetitive element sequence-based PCR, a PCR using primers complementary to two enterobacterial short repetitive sequences: repetitive extragenic palindromic and enterobacterial repetitive intergenic consensus sequences. All the stains showed a positive amplification, suggesting that the Brucella genome contains such sequences. Repetitive extragenic palindromic PCR was less discriminating than enterobacterial repetitive intergenic consensus PCR in terms of distinguishing strains, but a combination of the two methods was able to distinguish all the isolates, except for some strains belonging to biovars 3 and 9 of Brucella abortus. Repetitive element sequence-based PCR appears to be a simple and useful method for the study of brucellosis epidemiology.

Polymorphism in Brucella strains detected by studying distribution of two short repetitive DNA elements