Comparison of concatenated MLST gene fragments from our isolates to B. cenocepacia strains representative of the clonal diversity in the recA subgroup of this species (Fig 2), showed that ST-33 is most closely related to ST-32, which is a trans-continental epidemic strain that has been responsible for infections in Canadian patients and a large outbreak of B. cenocepacia in CF population in the Czech Republic [4,37]. This evidence concerns the gene RAD51 and cystic fibrosis.