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Opsonophagocytic killing of isogenic pneumococcal strains expressing serotype 6B, 14, and 19F capsules in the genetic backgrounds of TIGR4, 603, and 618 (A) and killing of the different genotypes or serotypes 19F, 14, and 6B, respectively (B). Opsonophagocytic killing of clinical isolates representing different MLSTs or different serotypes, which included at least two isolates: 19F, 9V, and 14 (C). Geometric mean concentrations are shown with the 95% CI.
