Correction

After the publication of this work [1] we found out that Table 1 was not filled in correctly in the original article. The total number of strains analyzed in the ptxP1 or the ptxP3 lineage was not shown between the brackets, leading to incompleteness of the data. The revised Table 1 is shown below.

Table 1 Presence of regions of difference in Dutch clinical isolates from 1993 to 2004

We regret any inconvenience that the incompleteness of Table 1 in the original article might have caused.