Detected LRI-clusters and signals between 1999 Feb 1^st and 2006 Sept 30^th by weekly analysis (recurrence interval ≥1 or ≥5 years) for different parameter settings.

The total number of detected clusters and signals is presented, for the non-restrictive parameter settings on space and time (A), for the settings with a maximum time window of 7 weeks (B), and for the settings with a maximum radius of 25 km (C). The distribution of (likely) causes according to the criteria in Figure 1 is also presented in the Table. * A cluster is defined by a set of successive cluster-signals that overlap in space and time. ** The cluster-signals in this category formed only one cluster, which appeared to be caused by a data artifact. *** Possibly unreported/undetected local LRI-outbreaks by undetected pathogens.