Figure 2. Bird- and flock-level seroprevalences of avian influenza (H5) in ducks and in-contact chickens monitored for infection, Central Java, Indonesia, March 2007–March 2008. Error bars indicate point-wise 95% confidence intervals. Flock-level seroprevalences are proportions of flocks where at least 1 bird had an antibody titer >24 to H5 virus. Estimates are adjusted for the survey structure.