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Antibody titers after vaccinia virus challenge. Serum was collected from the mice used in the experiment described in the legend of Fig. 2 at week 1 (A) and week 2 (B) postchallenge. Antibody titers from individual mice were measured by ELISA as described in the legend of Fig. 2. Five mice were used per group. Similar results for each of these groups have been reproduced in two or more similar experiments.
