FIG 7.

Minimum-spanning tree of subtypes of C. jejuni found in the six recreational rivers in the Manawatu region of New Zealand. Each pie chart represents one subtype and the colors represent different recreational swimming sites. Larger pie charts indicate a greater number of isolates of that subtype present. The thicker connecting lines show greater similarities between subtypes. For example, a thick-black solid line between ST-2381 and ST-3656 illustrates that they are different in only one allele of seven housekeeping genes.