Evolution of clonal complexes of 6C invasive pneumococcal strains according to penicillin (A) or erythromycin (B) susceptibility, during the three study periods (2002–2011).

<p>Related groups including STs with at least 5/7 identical alleles (as presented in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0090935#pone-0090935-t004" target="_blank">Table 4</a>) are indicated in brackets.</p>