Infectious FRNAPH (gray bars) and E. coli (black circles) concentrations detected in shellfish collected from the local harvesting area. For each sample, FRNAPH-I, FRNAPH-II, NoV GI, and NoV GII genome detection results are also given, expressed in genome copies per gram of hepatopancreas (HP). −, genomes undetected; +, concentration above the detection limit but unquantifiable (<1,067 and <400 gc/g of HP for FRNAPH and HuNoVs, respectively).