| Type of soil/Frequency of occurrence | ||
| Isolate | Artificially-contaminated | Contaminated soil from oil mill site |
| Saccharomyces cerevisae | 1 (3.3) | - |
| Aspergillus niger | 7 (23.3) | - |
| Penicillium expansum | 2 (6.7) | - |
| Rhizopus oryzae | 2 (6.7) | - |
| Aspergillus terreus | 3 (6.7) | - |
| Penicillium funiculosum | 1 (3.3) | - |
| Penicillium herquei | 2 (6.7) | - |
| Penicillium atrovenetum | - | 1 (33.3) |
| Mucor meihei | 2 (6.7) | - |
| Mucor racemosus | 2 (6.7) | - |
| Saccharomyces rouxii | 3 (10) | - |
| Candida valida | 1 (3.3) | - |
| Candida parapsilosis | 1 (3.3) | 1 (33.3) |
| Streptomyces nitrosporeus | 2 (6.7) | - |
| Kluyveromyces africanus | 1 (3.3) | - |
| Geotrichum candidum | - | 1 (33.3) |
| Total | 30 (100) | 3 (100) |