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In recent years this view has changed, because it has become apparent from nucleotide sequence data that recombinational exchanges are common in house-keeping genes from some bacterial species, and that the observed levels of linkage disequilibrium between alleles may sometimes be due to either ecological or geographical structuring within the population, or to poor sampling, rather than a low rate of recombination. The 37 isolates were selected from a large ribotyping study (15, 16), and from a previous MLEE study (17), to cover the diversity of typable and nontypable isolates....

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