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Killing of M. tuberculosis H37Ra
by EMB, INH, and RIF in BACTEC 12B medium. INH resistance emerged in
cultures exposed to INH alone. This was prevented by addition of EMB
(upright triangles) without otherwise affecting the rate of killing.
○, no drug; ░⃞, EMB; 
, INH;
, INH-EMB; ●, RIF.
