Inactivated H7 Influenza Virus Vaccines Protect Mice despite Inducing Only Low Levels of Neutralizing Antibodies.

However, the kinetics of the ELISA-detectable antibody response differed between seasonal viruses, which achieved peak titers 35 or 49 days postimmunization, and the H7 WIVs, whose ELISA titers often continued to increase until day 63, although the differences in titers between the different days did not reach statistical significance ( Fig. 1A ).

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