Fig. 1From: Methodological challenges to multivariate syndromic surveillance: a case study using Swiss animal health dataOutbreak detection. Statistical alarms (red triangles) raised by the improved Farrington algorithm applied to the time series of test requests (black bars) for laboratories A and B in 2010. Alarms are raised when the number of test requests on a given day exceeds the 0.995 percentile (blue dashed line)Back to article page