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Figure 3 | BMC Infectious Diseases

Figure 3

From: Assessing the use of hospital staff influenza-like absence (ILA) for enhancing hospital preparedness and national surveillance

Figure 3

The number of cases of hospital staff-ILA (blue) and London-ILI (red) above the upper bound for setting off an alarm, by week from April 2008 through April 2013. Points at or above the line y = 0 represent weeks when an alarm was triggered. The upper bound was set as the 95% quantile of the posterior predictive distribution, based on a baseline rate estimated using the previous six weeks of counts.

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