My father is type 2 diabetic & taking medicine for it. My father was diagnosed with pulmonary Tuberculosis 3 months back but he didn't told it to anyone in our family & didn't took any treatment as he thought it must be common cough & cold. But when his condition didn't improve we tested him & he was tested positive for TB. His chest x ray & CT scan shows significant infection to both lungs  showing consolidation involving cavitation in  both lungs, but no pleural/pericardial effusion. He has also got pneumonia because of this. Now he is taking DOTS treatment from last 10 days. But he is still coughing phlegm. When will his condition improve ?