Journal
PLOS ONE
Volume 7, Issue 10, Pages -Publisher
PUBLIC LIBRARY SCIENCE
DOI: 10.1371/journal.pone.0047239
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Funding
- Program for Zhejiang Leading Team of Science and Technology Innovation
- General Funds for Emergency Public Health Response from the Ministry of Health of China
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Objectives: We investigated a shigellosis outbreak in an elementary school to identify the source of infection, mode of transmission and risk factors for illness. Methods: In a case-control investigation, we compared the source of drinking water, consumption of untreated well water and suspected food items, and hygienic habits between case-students and randomly selected asymptomatic controlstudents, frequency-matched by class on a 1:1 ratio. Results: 18% of the 533 students and no teachers developed Shigella. 52%(44/85) of case-students and 17% (12/71) of control-students drank untreated well water (OR = 2.3, 95% CI = 1.1-5.8); 47% (n = 40/85) of case-students and 14% (10/71) of control-students drank untreated water from Well A (OR = 3.7, 95% CI = 1.3-11). The odds ratio increased with the amount of untreated Well A water consumed (p = 0.035, chi(2) test for trend). Rectal swabs from 5 of 6 case-students and water from Well A yielded Shigella flexneri 2b. Conclusions: This shigellosis outbreak was caused by drinking untreated water from a well polluted by Shigella flexneri 2b.
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