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Comparative rates of decline between IgG antibody to B. anthracis PA concentrations and total IgG antibody concentrations in sera from plasma donors. The rate of decrease in total IgG concentration was significantly less than that for the IgG to PA concentration over the interval from the last AVA injection (P < 0.0001) (A) and over the interval from initial plasmapheresis (P < 0.0001) (B). Regression lines and respective equations are included.
