Figure 1

Zhouxi Township map, showing the villages, tribes, genotypes, numbers of shigellosis cases, and road systems. The thicker green lines represent the Provincial Highway system, while the thin green line represents a road connecting the villages and tribes. Tribes with shigellosis during 2000-2007 are indicated in red, and otherwise indicated in black. The genotypes for the isolates and cases in each village are indicated and numbered in parenthesis.