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Proliferation (A) and gamma interferon production (B) by PBMC in response to recombinant (R) antigens 85A and 85B. Proliferative responses were assessed in four tuberculin-positive donors (PPD+) and in two tuberculin-negative (PPD−) donors. Gamma interferon concentrations were measured in supernatants of PBMC from three tuberculin-positive donors and two tuberculin-negative donors.
