"the globalization of the food industry, which enables large norovirus outbreaks to occur on an international scale."
"studies have shown that approximately 7% of foodborne outbreaks of noroviruses are part of an international event with a common source. Globally, noroviruses rank among the top causes of foodborne disease"
de Graaf, M., van Beek, J. & Koopmans, M. P. (2016). Human norovirus transmission and evolution in a changing world. Nat Rev Microbiol, 14(7), ss. 421-433. DOI:10.1038/nrmicro.2016.48