Direct ELISA allows for the measurement of antibody levels to a particular antigen. Serum or plasma from the vaccinated subject are incubated on high-binding capacity microplates precoated with the antigen of interest and detected utilizing an enzyme-linked secondary antibody. Herein, using influenza hemagglutinin as model antigen, we describe the quantification of antigen-specific IgG titers in mouse serum to measure vaccine-induced humoral responses.
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