Forest plot of point a random effects model estimate of proportion seropositive and 95% confidence intervals (CIs) for the 5 nonendemic studies in Supplemental Table 1. Events are the number of positive cases in each study. Point estimates for each study are shown as squares and whiskers show 95% CIs. The summary random effects model point estimate and 95% CIs are shown as a diamond. Heterogeneity, τ ², χ ², and P value for the Q statistic are shown below. Estimates of heterogeneity were calculated by first invoking the random effects model with double-arcsine transformation and the restricted maximum likelihood estimator method.