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Phylogenetic tree comparing the porA sequences of representative Campylobacter jejuni and Campylobacter coli strains isolated from dairy A environmental samples with that of the clinical outbreak strain (outbreak 1, 2006 to 2007). *, clinical outbreak strain. Dairy strains with the identical porA and multilocus sequence typing alleles and indistinguishable SmaI and KpnI patterns are underlined. The scale bar represents the number of nucleotide changes per site.
