In Italy, even though the total number of NoV foodborne cases is probably largely underestimated (an average of 72 cases per year is officially notified), the number of foodborne outbreaks showed an increasing trend during the period of the study 2017–2019.
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Occurrence of Human Enteric Viruses in Shellfish along the Production and Distribution Chain in Sicily, Italy.
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NoVs were the most frequently detected viral contaminant accounting to the 4.32% (CI 95% 1.19–7.45%) of all the batches analyzed along the course of the current surveillance study, showing a decreasing trend with respect to 18.5–55% observed in previous works [ 21 , 33 ].