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Comparison of foodborne virus copy number detected by Concanavalin A immobilized on polyacrylate beads (Con A-PAB) and QIAamp Viral RNA Extraction Mini Kit (VRNA) methods. The cut-off for samples was set at Ct-value of 40. Hepatitis A virus strains 14 and 18f; HuNoV strains GI.4, GI.2, GI.5, GII.1, GII.4, and GII.13; Rotavirus strain G2; ND, not detected
