Case 165. Lepromatous leprosy (35 y-o M)

       
  Biopsy from erythematous and scaling nodules on the extremities of a Paraguaian Nisei  
       

 

  Mycobacteria consisting of "globi" are strongly stained with immunostaining for BCG antigens. The antiserum available from DakoCytomation is widely cross-reactive to Mycobacterium species.