pET-21b, pET-22b, Luria-Bertani (LB) medium and carbenicillin were obtained from Sigma (St. Louis, MO, USA); isopropyl-1-thio-beta-D- galactopyranoside and Ni-NTA agarose were obtained from Qiagen (Gaithersburg, MD, USA); skim milk was from Morinaga (Tokyo, Japan); horseradish peroxidase-conjugated anti-human IgG or IgA antibodies was from Dako (Carpinteria, CA, USA); and SureBlue reserve TMB microwell peroxidase substrate was obtained from KPL (Gaithersburg, MD, USA). Expression and purification procedures for recombinant mycobacterial antigens (ESAT-6, CFP10, MDP1, Ag85A, Acr, HBHA and HrpA) were described previously [34 (link)].
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