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Titration of anti-CFA/I and anti-CS1, -2, -3, -4/6, -5/6, and -6 IgG antibodies in serum samples of the immunized mice (solid dots) and control mice (circles). Heat-extracted CFA/I and CS1, -2, -3, -4/6, and -5/6 or purified CS6 adhesins were used to titrate IgG antibodies from serum samples. Optical densities were used to calculate IgG antibody titers (log10).
