Fig. 3. Changes of pH after washing pretreatment agent with PBS or DW and after inoculation of the specimenin MGIT. (A) pH of PBS and DW, (B) pH of the specimen after pretreatment and washing, (C) pH of the MGIT after inoculation of the specimen. MGIT, mycobacterium growth indicator tube; PBS, phosphate buffered solution; DW, distilled water.