RT Journal Article SR Electronic T1 Postscript JF Drug and Therapeutics Bulletin JO Drug Ther Bull FD BMJ Publishing Group Ltd SP 60 OP 60 DO 10.1136/dtb.29.15.60-a VO 29 IS 15 YR 1991 UL http://dtb.bmj.com/content/29/15/60.2.abstract AB Extra-pulmonary tuberculosis (2 April 1991, page 26) was about infections caused by Mycobacterium tuberculosis, and excluded infections by atypical mycobacteria such as M. avium-intracellulare. These atypical organisms are the commonest cause of lymphadenitis in children and respond poorly to chemotherapy.