Fig. 2From: Varicella seroprevalence in healthcare workers in a tertiary hospital: an audit of cross-sectional dataAge-group specific seroprevalence with 95 % confidence intervals. We have plotted age-group specific seroprevalence rates with error bars for the health screenings performed in (1) 2009, (2) 2011, (3) 2012 and (4) 2014. For the purpose of illustration we have added the seroprevalence curve for 2014Back to article page