Minimum spanning tree analysis of 167 methicillin-resistant
(MRSA) patient isolates. The size of each circle is proportional to the number of isolates. Ridom spa types are presented in each circle. Numbers intersecting the black lines indicate the difference in the number of repeats between connecting circles. Colours refer to the number of MRSA isolates: red > 20, dark blue ≤ 5, light blue ≤ 2.