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Genetic diversity of a recently emerged serotype (28F). Boxplots showing within (Malawi) and between country (Malawi and South Africa) genetic diversity of serotype 28F isolates showing in GC2 (A) and GC21 (B). Lineage GC21 also includes serotype 9V isolates, some of which underwent a capsule switch to acquire a serotype 28F capsule. Abbreviation: SNP, single-nucleotide polymorphism.
