| Sample site | AM20 | MGO | |||
| Contam. | Not contam. | Contam. | Not contam. | ||
| All sample sites | 701* | 47 (7%) | 654 (93%) | 35 (5%) | 666 (95%) |
| Biopsy channel | 146 | 5 (3%) | 141 (97%) | 6 (4%) | 140 (96%) |
| Suction channel | 137 | 4 (3%) | 133 (97%) | 5 (4%) | 132 (96%) |
| Forceps elevator | 148 | 14 (10%) | 134 (90%) | 7 (5%) | 141 (95%) |
| Brush | 139 | 17 (12%) | 122 (89%) | 14 (10%) | 125 (90%) |
| Protection cap | 56 | 6 (11%) | 50 (89%) | 3 (5%) | 53 (95%) |
| Elevator channel | 53 | 0 | 53 | 0 | 53 |
| Air/water channel | 26 | 1 (5%) | 21 (95%) | 0 | 22 |
*Sampling of all possible sites would have yielded 745 samples: 44 (6%) sites were not sampled. This included 4/150 (3%) biopsy channel, 13/150 (9%) suction channel, 2/150 (1%) forceps elevator, 11/150 (7%) brush, 9/65 (13%) protection cap, 2/55 (4%) elevator channel and 3/25 (12%) air/water channel samples.
AM20, microbial growth with ≥20 CFU/20 mL of any type of microorganism; Contam., contaminated; MGO, presence of any microbial growth of gastrointestinal or oral microorganisms; Not contam., not contaminated.