| Germs | Positive sample number | Positive sample percentage |
| Pseudomonas aeruginosa | 12 | 57.1% |
| Coagulase-negative staphylococcus | 5 | 23.8% |
| Klebsiella pneumoniae | 3 | 14.3% |
| Klebsiella oxytoca | 1 | 4.8% |
| Citrobacter | 1 | 4.8% |
| Staphylococcus aureus | 1 | 4.8% |
| Serratia marcescens | 1 | 4.8% |
| Amoebae (cysts) | 5 | 23.8% |
| Fusarium | 1 | 4.8% |