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Maximum likelihood phylogenetic tree constructed with the pan-genome (a) and core genome (b) differences among 170 C. jejuni clone SA isolates from sheep and cattle. The clone SA strains are intermixed between sheep and cattle and among the isolation years (2002, 2007, and 2014). The isolates are color-coded based on their source hosts and isolation years: red for sheep, blue for NAHMS Dairy 2002 cattle, green for NAHMS Dairy 2007 cattle, and black for NAHMS Dairy 2014 cattle.
