TABLE 3.
Incidence of RAPD types for L. monocytogenes strains from samples obtained at different production stages for 18 fish monitored during production in plant I in November 1998
| Sampling site | Sample source | Total no. of samples | No. of positive samples | No. of isolates with the following RAPD types:
|
|||
|---|---|---|---|---|---|---|---|
| RAPD type 2 | RAPD type 6 | RAPD type 12 | RAPD type 15 | ||||
| Raw fish area | Raw fish | 18 | 0 | ||||
| Contact surfacesa | 20 | 5 | 4 | 1 | |||
| Production environmentb | 52 | 5 | 3 | 2 | 1 | ||
| Smoking area | Fish after smoking | 4 | 0 | ||||
| Slicing area 1 | |||||||
| Slicer 1 | Contact surfacesa | 9 | 5 | 3 | 2 | ||
| Final product | 12 | 7 | 6 | 1 | |||
| Slicer 2 | Contact surfacesa | 7 | 3 | 2 | 1 | ||
| Final product | 12 | 8 | 1 | 6 | 1 | ||
| Production environmentb | 20 | 5 | 1 | 3 | 1 | ||
| Slicing area 2, slicer 6 | |||||||
| Contact surfacesa | 14 | 7 | 7 | ||||
| Final product | 12 | 0 | |||||
| Production environmentb | 24 | 6 | 6 | ||||
a
Surfaces which were in contact with the unfinished product (equipment surfaces, conveyor belts, gloves of employees, etc.).
b
Production environment (walls, tables, undersides of machines, trucks, drains, etc.).