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Neutralization assay measuring TCID50. Antibody-mediated neutralization of influenza virus was evaluated by measuring the TCID50 of influenza virus. IgGs for both FI6v3 and HC19 displayed stronger neutralization than did the respective Fabs. While HC19 Fab could neutralize virus to some degree, FI6v3 Fab did not exhibit a significant ability to neutralize the virus (*, P > 0.05; **, P < 0.01).
