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(Upper panel) Correlation between concentrations of IgA antibodies to whole pneumococci (WC) in lung lavage fluid and saliva from mice which had been immunized via different routes with heat-inactivated pneumococci type 4 plus CT (r = 0.89; P < 0.0001). (Lower panel) Correlation between concentrations of IgA antibodies to whole pneumococci type 4 in serum and lung lavage fluid from the same mice (r = 0.93; P < 0.0001).
