Granuloma with positive AFB Is Leprosy caused by M.leprae. M. leprae is acid fast bacilli. Syphilis caused by Treponema pallidum (spirochaete), which is not stained by acid fast stain. Diagnosed by dark ground microscopy and other serologicaL tests. Trench fever caused by Baonella quintana. Baonellaspecies areGram-negative pleomorphic rods thatstainpoorly with theGram stainbut better with the Gimenezstain. Cat scratch disease caused by Baonella henselae leads to bacillary angiomatosis.