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Outbreak investigations were conducted by the Xuhui District Center for Disease Control and Prevention according to Chinese guidelines on norovirus outbreak investigation, prevention and control (2015). As the investigation was an urgent public health response to the outbreak and interviewing and sample collection posed minimal risks, written informed consent was waived by the Ethics Review Board of Xuhui District Center for Disease Control and Prevention. Instead, oral informed consent was obtained from each participant on the spot or, for those aged <\u200916\u2009years, from their parents or legal guardians by phone call prior to the sampling.","order":1,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethics approval and consent to participate"}},{"value":"Not applicable.","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Consent for publication"}},{"value":"The authors declare that they have no competing interests.","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Competing interests"}}],"article-number":"592"}}