Fig. 3From: Changes in MLST profiles and biotypes of Corynebacterium diphtheriae isolates from the diphtheria outbreak period to the period of invasive infections caused by nontoxigenic strains in Poland (1950–2016)Distribution of STs by type of infections (n – number of isolates included in the study). The charts do not include isolate 72/E (site of isolation is not known)Back to article page