FIG 3.

Minimum spanning tree based on the core genome MLST genes of 52 Clostridium perfringens strains from foodborne outbreaks in the United States. Nodes represent core genome MLST sequence types and were labeled according to the outbreak. Classical MLST types of the outbreak strains are also indicated where applicable. Red boxes mark monoclonal clusters detected in the outbreak. Connected blue boxes indicate more than one cluster identified in the outbreak. Clusters were identified based on fewer than seven allelic mismatches (gray shading). Numbers on the connecting lines illustrate the number of target genes with different alleles, represented by solid lines for allele differences below 40 and dotted lines for allele differences above 40. The minimum spanning trees was generated using Ridom SeqSphere v07 (https://www.ridom.de/).