Challenges of investigating a large food-borne norovirus outbreak across all branches of a restaurant group in the United Kingdom, October 2016 Morgan, Mari and Watts, Vicky and Allen, David and Curtis, Daniele and Kirolos, Amir and Macdonald, Neil and Maslen, Ellie and Morgan, Deb and Saei, Ayoub and Sedgwick, James and Stevenson, Janet and Turbitt, Deborah and Vivancos, Roberto and Waugh, Catriona and Williams, Chris and Decraene, Valerie, Eurosurveillance, 24, 1800511 (2019), https://doi.org/10.2807/1560-7917.ES.2019.24.18.1800511