Comparison of Subtypes of Listeria monocytogenes Isolates from Naturally Contaminated Watershed Samples with and without a Selective Secondary Enrichment
Figure 2
Minimum spanning tree with categorical data of all 62 MLVA types containing all 304 isolates.
Each circle is labeled with the MLVA type it represents. The size of the circle and number of divisions represent the number of isolates of that type. The blue and yellow segments represent isolates obtained by Direct plating or with Fraser broth, respectively. Heavy short connecting lines indicate a difference in a single locus; thinner, longer lines connect nodes with 2 and 3 locus differences; dotted lines connect nodes with 4 locus differences; a gray line connects nodes with 5 locus differences.