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Mapping of cases by serotype showing significant spatial clusters within greater Phnom Penh, by smallest administrative district (sangkat) (n = 216). Note: Cluster 1 (radius- 5.2 km): 46 cases; relative Risk = 2.1 (p = 0.004); Cluster 2 (1.7 km): 43 cases; relative Risk = 1.9 (p = 0.031).
