Sir, The sputum AFB test is negative, and other tests are also negative except CT Scan which says infective? Etiology? Koch's. His age is 70 weight 43 kgs height 5 11. He used to have cough and cold on and off, no chest pain, no blood seen in sputum, he says he did not have fever before except for 3 days which he do not have now. Please suggest what to do?