Figure.

Analysis by minimum spanning tree based on 1,475 core genome multilocus sequence typing targets of isolates recovered in 2013 during a Legionnaires’ disease outbreak, Germany (n = 42 strains)

CT: cooling tower; WWTP: waste water treatment plant.

Numbers on lines represent the allelic differences between the isolates. All but four isolates in the Figure are sequence type (ST) 345. The two ST600 isolates are indicated with (§). All ST345 isolates which are unrelated to the outbreak and which serve as outgroup belong to the monoclonal antibody (mAb)-subgroup Knoxville, except EULV5358, which is mAb subgroup OLDA and which is indicated with (*).