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Average killing activities of human PBMDMs against three MDR M. tuberculosis strains (resistant to RIF and INH) (MDRTB) and three antibiotic-susceptible M. tuberculosis strains (TB) including strain ATCC 27294 swhen either CPZ (A) or TZ (B) was present in the medium at concentrations of 0.01 and 0.1 mg/liter. The control value is the average numbers of CFU for cultures of all six strains to which no phenothiazine was added, inasmuch as the CFU did not differ appreciably between strains.
