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Maximum likelihood trees of (a) VP7 and (b) VP4 nucleotide sequences collected from the same farm (shown in black) and sequences collected in a UK-wide surveillance study (shown in grey) described in Chandler-Bostock et al. (2014). Sequences are denoted as species of origin|country|year collected|genotype|sample ID. Where there are more than 4 identical sequences, braches were collapsed. The bar at the bottom represents nucleotide distance.
