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[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 ...200717238056
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