FIG 1.

Genetic diversity of S. aureus isolates obtained from three different anatomic sites in a single farmed rainbow trout from a London fish farm. A minimum-spanning tree was constructed using an alignment of the 12 fish isolates, created by mapping to the S. aureus LGA251 reference genome. Points represent groups of identical isolates, with point sizes correlated to the number of isolates. Due to the low number of SNPs, each SNP was manually checked to ensure that it was not a consequence of mapping errors. The colors represent different sampling fish sites: intestine, gills, and skin. Isolates extracted using charcoal swabs are indicated in a darker shade, whereas isolates extracted from tissue samples are indicated in a lighter shade.