“…Many Mikulicz cells and scattered Russell bodies can be seen. possible to reproduce the disease by animal inoculation and some authors (Reyes, 10 Quevedo, 6 Cunning and Guerry 4 ) still look upon the bacillus as a secondary invader and suggest that the real cause is a virus mfection. Pathology The tissues become invaded by masses of inflammatory cells in which plasma cells predominate.…”