Mesquita, J.R.Costa, I.Oleastro, M.Conceição-Neto, N.Nascimento, M.S.2015-02-192015-02-192014-10-15J Infect Dev Ctries. 2014 Oct 15;8(10):1350-2. doi: 10.3855/jidc.48801972-2680http://hdl.handle.net/10400.18/2926Introduction: This study describes the investigation of a gastroenteritis outbreak in a group of students, associated with a dinner reunion in February 2013 in Porto, Portugal. Methodology: An anonymous structured questionnaire was developed and sent to 34 students who attended the dinner reunion. Eighteen students completed the questionnaire and thirteen met the case definition (attack rate of 72%). Stools from two students were screened for norovirus by RT-PCR using primer pairs that target the highly conserved polymerase gene and the capsid gene. Results: Norovirus genotyping confirmed the variant Sydney 2012 as the probable cause of the outbreak. Conclusion: This is the first report of an outbreak associated with the new variant Sydney 2012 in Portugal.engNorovirus GII.4 SydneyNorovirusFoodborneOutbreakPortugalInfecções Gastrointestinaisjournal article10.3855/jidc.4880