<prompt> Most common agent causing tuberculosis in AIDS patient in tropical countrie is -Mycobacterium tubercolusisMycobacterium intracellulareMycobacteriumparvumMycobacterium atypical  <response>: In the USA and other Western countries the characteristic pathogen now is M.tuberculosis. REF:ANANTHANARAYAN AND PANIKERS TEXTBOOK OF MICROBIOLOGY 9TH EDITION PAGE NO-576 