| Biopsy from a peritoneal granuloma showed caseation necrosis and acid-fast bacilli. |
| Acid-fast bacilli were numerous, both intracellularly in histiocytes and extracellularly in necrotic areas. |
| Cultures of right and left lung tissues were obtained for bacteria, acid-fast bacilli, and fungi. |
| Special stains were negative for acid-fast bacilli, fungal forms, Pneumocystis, and other bacteria. |
| The elongation phase of growth distinguishes bacilli from cocci, which grow and divide by pure septation. |
| Tubercle bacilli can remain dormant for years before producing active disease. |
