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Distribution of bivalve shellfish samples collected from March 2018 to February 2020, with monthly positivity rates for norovirus (NoV), rotavirus A (RVA), human adenovirus (HAdV), and human bocavirus (HBoV) each month from March 2018 to February 2020. Initial norovirus results, published by Sarmento et al. [17], are shown in fading red.
