FIG. 1.

Urease-specific serum IgG (A, B, and C) and salivary IgA (D, E, and F) for monkeys which received sham immunization (A and D), oral immunization with urease plus E. coli LT (B and E), or intramuscular urease plus Bay (C and F). Results are shown for samples obtained before immunization (0 week), 2 weeks following immunization (14 weeks), just prior to challenge (arrow), and at 4 and 11 weeks (IgG only) after challenge (18 and 25 weeks, respectively). Serum IgG is expressed as the reciprocal of the lowest titer to exceed a threshold of 0.10 absorbance unit. Salivary IgA is expressed as A₅₅₀.