Fig. 5

Significant spatio-temporal clusters (P < 0.05) of A(H7N9) human infections in China as identified by the space-time permutation scan statistic (phase II), which are illustrated by the most likely cluster (pink circle), a secondary cluster 2 (green circle) and a secondary cluster 3 (yellow circle). The blue arrows describe the chronological progression of clusters, and outbreaks represented by red and black dots are also shown