Detection timeliness and sensitivity of the method applied to the confirmed p9 outbreaks using census tract centroids and individual addresses.

The dates detected by the space-time permutation scan statistic are in agreement with the two documented ‘waves’ of the p9 outbreak in San Francisco County. With the exception of the first outbreak, the time windows are consistently shorter when exact coordinates are used. While the detection timeliness is greatly improved using exact coordinates, the detection sensitivity is only slightly greater using individual addresses than census tract centroids.