Average antibody (µg/ml) and/or enzyme (mU/ml) levels for the VAC, VEC, VEC+VAC treated rats during the Training and Cocaine Challenge Phases.

Cocaine hydrolase activity and anti-cocaine antibody levels were assessed midway through the training phase (day 8) and at the onset of the challenge phase (day 29). Means and standard errors are shown. Neither of the measured variables changed significantly across the course of the experiment, and there were no significant differences for either variable across treatment groups.