Five ill persons provided stool specimens, which all tested positive for norovirus genogroup I by polymerase chain reaction. These specimens also tested negative for Salmonella, Shigella, Escherichia coli O157:H7, and Campylobacter.
Morbidity and Mortality Weekly Report. 2015;64(18):485-490. © 2015 Centers for Disease Control and Prevention (CDC)