Fig. 5

Results of phenotypic experiments with significant differences. Red symbols: K. pneumoniae ST307 outbreak isolates; yellow symbols: K. pneumoniae non-ST307 internal isolates; blue symbols: K. pneumoniae external isolates. Red circle: occurrence of plasmid 1 in K. pneumoniae ST307 outbreak isolates and PBIO1961; orange circle: occurrence of plasmid 2 in K. pneumoniae ST307 outbreak isolates, PBIO1979, and PCV1935; red open circle: incomplete plasmid 1 in PCV1935. Isolates belonging to ST307 are highlighted in dark gray, and all other isolates in light gray. a Results of the hypermucoviscosity test are given as mean values and standard deviation of the string length in millimeters (mm) for each isolate. b Results of siderophore secretion tests are given as mean values and standard deviation of the secretion zone diameter in millimeters (mm) for each isolate. c Siderophore secretion experiment on CAS-Agar of six exemplary isolates: PBIO1953 (outbreak isolate [ST307]), PBIO1951 (internal control [ST395]), PBIO2008 (external control [ST15]), PBIO2009 (external control [ST307]), hvKP1 (external hypervirulent control [ST86]), and PCV1935 (outbreak plasmid-cured variant [ST307]). Yellow areas around colonies indicate siderophore secretion. Abbreviations and symbols: n.s., not significant; ****p value < 0.0001; ***p value < 0.001; **p value < 0.01