Fig. 2From: Antibody induced by one-dose varicella vaccine soon became weak in children: evidence from a cross-sectional seroepidemiological survey in Beijing, PRCSeroprevalence of 1-9 years permanent Beijing residents in 2012 who denied varicella history and had received one dose vaccine based on verified vaccination records. Distribution of different age groups by different between vaccination and blood sampling interval (n = 165)Back to article page