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Pairwise SNP distances between closely related isolates. (a) Comparison of SNP distances between isolates in a single PFGE group (group A1) and between epidemiologically linked isolates within the same PFGE group. (b) Comparison of genetic diversity (measured in SNP distances between isolates) within epidemiologically linked outbreak groups, mother-baby paired isolates, isolates from a single host, and isolates from repeated sequencing of the reference strain EGD-e for quality control.
