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Opsonophagocytic killing of serotype 6B and 19F pneumococcal strains; each strain was analyzed with 5 to 6 different sera from vaccinated individuals. The results for individual strains (A) and for all strains, mucosal strains, and invasive strains combined (B) are presented as GMCs required for 50% opsonophagocytic killing with 95% CI. ***, P < 0.001 (Student's t test, 2-tailed with unequal variance).
