Frequency of putative resistance alleles from candidate loci in the Maela and Massachusetts populations.

<p>The resistant allele frequency at each locus (rows) in each population cluster (columns) is represented by different shades on a blue-grey scale. Vaccine and non-vaccine serotype status of each cluster are shown at the top of each column. Asterisks highlight two drug resistant global clones: * represents the PMEN1 lineage; ** represents the PMEN14 lineage. Note that mixed population clusters have been removed from the diagram.