Figure 2. Frequency of common serotypes among the different years in Shenzhen Children’s Hospital.
(For serotype 14: χ2 = 0.9, 19F: χ2 = 0.01, 19A: χ2 = 2.94, 23F: χ2 = 0.87, 6B: χ2 = 0.71; all P value >0.05.).
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