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Maximum-likelihood tree of the 36 Ia nucleotide sequence types detected in E. coli isolates from human and nonhuman vertebrates living in Australia. In each label, the first number is the ST and the number in parentheses is the number of times the ST was observed, followed by the genetic groups of E. coli in which the ST was detected and finally if the ST co-occurred with the microcin V operon in the same strain. Bootstrap values are based on 500 replicates.
