my father coughed phlegm with blood.i already having the past history of t.b 61 years ago. now he is 77 years old. afg stain negative. pcr mtb culture =ve.dr says in exray there is a marking of calcified scar lesions.according to grams stain result dr prescribed doxycycline 200mg 1 od for 15 days.we are waiting for the result of sputum culture .dr said after two weeks we can get the result. already he prescribed r.cinex 450mg 1 od.my father had severe cough night chills loss of weight.lost his hunger.3 months ago he had severe poly arthirits. please dr guide me further whether we are in the right track of treatment.