Surface bioburden expressed as mean cfu per about 25 cm2 of the outer layer of three kinds of infusion bags
| Number of cfu | Number of bags | ||
| 100 mL | 500 mL | PN | |
| 0 | 7 | 18 | 36 |
| 1–5 | 13 | 12 | 10 |
| 6–10 | 5 | 5 | 0 |
| 10–50 | 4 | 3 | 1 |
| >50 | 1 | 2 | 2 |
| Total number of bags tested | 30 | 40 | 49 |
First horizontal row: we found zero cfu on 7 100 mL bags, 18 500 mL bags and 36 PN bags: second horizontal row we found 1–5 cfu on 13 100 mL bags, 12 500 mL bags and 10 TPN bags etc.