Epidemiological Survey and Analysis on an Outbreak of Gastroenteritis due to Water Contamination.pdfVIP

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Epidemiological Survey and Analysis on an Outbreak of Gastroenteritis due to Water Contamination.pdf

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Epidemiological Survey and Analysis on an Outbreak of Gastroenteritis due to Water Contamination.pdf

BiomedEnvironSci，2011；24(3)：275—283 275 OriginalArticle EpidemiologicalSurveyandAnalysisonanOutbreakofGastroenteritisdueto W aterContamination YANG ZhiCong ，W UXinWei，LITieGang，LIMeiXia，ZHONG Yi，LIU YuFei，DENGZhiAi， DIBiao，HUANG Cong，LIANGHuiYing，andWANG M ing GuangzhouCenterforDiseaseControlandPrevention,Guangzhou510080,GuangdongChina Abstract 0bjective TodocumenttheinvestigationandcontrolofanoutbreakofgastroenteritisinCityG．South China，andprovideareferenceforpreventingfutureoutbreaks． Methods Anambispectivecohortstudywasdesigned．Attackrate(AR)andrelativerisks(RR)were calculated to identify the causes ofgastroenteritis．Investigationsusing questionnaires included personalinterviewswithpatientsanddoctors，reviewsofmedicalrecords，laboratoryexaminationsof fecalspecimensandcontinuoushygienemonitoringofwatersamplesfrom thewaterworks． Results 0veraIlJ427／71534(AR=5．97％0)caseswereidentifiedbetweenOctober31andNovembet12 2010．Geographicdistributionwashighlylocalized，with80％ofcasesoccurringintheareassuppliedby waterworks—A．Consumptionofwaterprovidedsolelybywaterworks．Awasfoundtobeassociatedwith iIIness(RR=8．2O，95CI％：6．12-10．99)cornparedwiththatfromwaterworks—B．Micr0bi0logicaIanalyses confirmedthepresenceofNorovirusinsixofeightfecaIsamplesfrom symptomaticpatients．twowater samplesfrOm waterworks—A andtwosewagesamples．Aftertakingeffectivemeasures．thehygienic indicesofwaterworks—A methealthcriteriaagainonNovember9andnocaseswerereported3days later． Conclusion Theoutbreakreportedherewascausedbydrinkingtapwatercontaminatedwithsewage atthesource．Earlyidentificationofpossiblecontamination sourcesandawarenessofchangesthat mightnegativelyimpactwaterquailtyareimportantpreventivemeasurestoprotectpublich