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The Ziehl-Neelsen stain revealed numerous beaded acid-fast bacilli of intermediate length, corresponding to the gram-positive bacilli seen on the Gram stain.
However, Gram, Grocott methenamine silver, and Ziehl-Neelsen stains revealed no bacterial, fungal, or mycobacterial microorganisms.
After Ziehl-Neelsen stain of tissue impressions, acid-fast rods were microscopically detected in the liver and intestine.
In both animals, Ziehl-Neelsen stain demonstrated large numbers of acid-fast bacilli within macrophages (Figure, panel B).
Grocott stains were negative, but Ziehl-Neelsen stains showed a large number of acid fast bacilli (Fig.
Results of Gram's and Ziehl-Neelsen stains were negative for bacteria.