Figure 1From: The 7-valent pneumococcal conjugate vaccine elicits cross-functional opsonophagocytic killing responses to Streptococcus pneumoniae serotype 6D in children Geometric mean opsonic indices of serogroup 6 in response to PCV7 according to vaccination status. *P<0.05, Booster compared with primary and control groups; **P<0.05, Primary compared with control group PCV7; 7-valent pneumococcal conjugate vaccine.Back to article page