Fig. 4

Genetic composition of the CPS sequences in wild type and variant 6B serotypes. The CPS locus sequence of serotype 6B [CR931639] was used as reference. The branches were coloured based on the type of the strain, either carriage (red), invasive (green), or reference (blue). a shows the distribution of SNPs within the CPS locus among the variants and invasive 6B serotypes. The black marks to the right of the terminal taxa represent location of SNPs within the CPS sequences. b shows the location of genetic recombination events. Unique recombination events are coloured in blue and shared (non-unique) events are coloured in red. Branches matched with an asterisk (*) represent nodes with a bootstrap value of 100 %