Risks of shigellosis by exposure in 85 cases and 71 controls in the school, Sichuan Province, China, 2009.

<p>NOTE.*Chi square for trend: χ² = 4.4, P = 0.035.</p

Epidemic curve.

<p>Epidemic curve for reported cases of Shigellosis by 1-day interval during a school outbreak, Sichuan Province, China, 2009.</p