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Time-dependent frequency changes at different virus concentrations. (A) Frequency changes of the immunosensor using A/PR/8/34 virus. (B) Frequency changes of the immunosensor using B/Lee/40 virus. (C) Nanoparticle-conjugated anti-influenza A monoclonal antibody (A/PR/8/34). (D) Nanoparticle-conjugated anti-influenza B monoclonal antibody (B/Lee/40). (
) 108 pfu/mL, (
) 107 pfu/mL, (–■–) 106 pfu/mL, (
) 105 pfu/mL, (–▴–) 104 pfu/mL, (
) 103 pfu/mL, and (
) negative.
