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Indicator microorganisms included as representative markers of the organism groups shown
| GROUP | INDICATORS |
| Bacterial | Spores: Bacillus sp., Clostridium |
| Tuberculous Mycobacteria: (M. bovis &M. tuberculosis) Non-Tuberculous Mycobacteria: (other Mycobacteria) | |
| Vegetative: Pseudomonas, Enterobacteria, Staphylococcus | |
| Viral | Nonlipid (small): picorna viruses (e.g. Polio) |
| Lipid (medium): HIV, Hepatitis B, herpes viruses | |
| Fungal | (e.g. Trichophyton, Candida, Aspergillus) |
| Other | CJD |
