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The percentage of bacteria/archaea of a given respiratory type (facultative [aerobic/anaerobic] and gram stain type [positive/negative] within environmental and human-related groups [oral, pathogenic, or other])
| Group | (Facultative) anaerobic | (Facultative) aerobic | Gram-positive | Gram-negative |
|---|---|---|---|---|
| Environmental | 4% | 96% | 66% | 34% |
| Oral | 76% | 24% | 45% | 55% |
| Pathogenic | 51% | 49% | 32% | 68% |
| Other human-related | 46% | 54% | 70% | 30% |
