Distribution of genotypic phase variable expression status of <i>hmbR:hpuA</i> genotypes among a representative panel of English, Welsh and Northern Irish invasive serogroup B meningococcal isolates collected from 2008–2011.

<p>This figure shows the number (a) or percentage (b) of isolates with particular combinations of PV expression states. In graph (a), there is further separation based on clonal complex. UA = unassigned STs. <i>hmbR only</i> = isolates that possess <i>hmbR</i> but not hpuA. <i>hpuA</i> only = isolates that possess <i>hpuA</i> but not <i>hmbR</i>. <i>hmbR:hpuA</i> = isolates that possess both <i>hmbR</i> and <i>hpuA</i>.