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Population snapshot of pneumococcal clones isolated from IPD patients during 5 study years constructed using eBURST. Filled circles represent individual STs, and the size of each circle indicates the number of isolates belonging to that ST. Lines join STs of the same CC, i.e., those that have 6 out of 7 housekeeping gene alleles in common. Dark-gray filled circles indicate the predicted founder of a CC, and light-gray filled circles indicate subfounders.
