291. How long after initiating multidrug antituberculous therapy must pt be isolated, if AFB negative and no extensive disease? / How long if AFB positive or extensive disease? April 9th, 2008 by reuben in TB Back Top Tags: card 290. Tick paralysis ddx & features / How to remove a tick 292. Describe the four stages of tuberculosis infection Leave a Reply Cancel reply Please post any discussion to the emupdates Reddit page.