Percentage frequency of bacteria found contaminating sites before cleaning
| Species of bacteria | Frequency (%) n=73 |
|---|---|
| Bacillus cereus | 1.4 |
| Bacillus sp | 21.9 |
| Coliform (non-lactose fermenter) | 1.4 |
| Coliforms | 31.5 |
| Corynebacterium sp | 5.5 |
| Micrococcus sp | 1.4 |
| Pseudomonas sp | 1.4 |
| Staphylococcus aureus | 1.4 |
| Staphylococcus epidermidis | 30.1 |
| Viridans streptococcus | 2.7 |