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abstractpubmed· Abstract 2020· item PMID:31855546

Infectivity of Norovirus GI and GII from Bottled Mineral Water during a Waterborne Outbreak, Spain. During a waterborne outbreak of norovirus in Spain, we estimated 50% illness doses for a group of exposed (secretor) persons to be 556 (95% CI 319-957) genome copies/day for norovirus GI and 2,934 (95% CI 1,683-5,044) genome copies/day for norovirus GII. Use of a propidium monoazide viability assay reduced these values.