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Humoral responses to MBP83 and PPD-B at 14 weeks postinfection. Shown are the OD450 absorbances of total IgG to MPB83 and PPD-B from individual goats infected or not with M. caprae. The results are expressed as ΔOD450 (OD450 of antigen-stimulated wells minus OD450 of nonstimulated wells). Filled symbols, infected animals; open symbols, noninfected control animals; dashed horizontal line, cutoff point for positivity.
