[frozen berries as a risk factor for outbreaks of norovirus gastroenteritis. results of an outbreak investigation in the summer of 2005 in hamburg]. | an outbreak of acute gastroenteritis occurred in hamburg among guests of a canteen in august 2005. a total of 241 persons were found ill. in stool samples of 16 of them norovirus genogroup i was identified. neither bacterial nor viral pathogens could be detected in food samples. among 162 guests enrolled in a cohort study, 69 (42.6 %) met the case definition. a desert dish made from blackberries and yoghurt showed a significant association with the disease (rr 6.9; 95% ci 3.36-14.16). in additio ... | 2007 | 17238056 |