TABLE 3.

Distribution of L. monocytogenes-positive water samples per sample localea

Sampling siteNo. of samplesNo. of presumptive Listeria-positive enrichments (%)No. of L. monocytogenes-positive samples (%)No. of L. monocytogenes isolates
MST 1163 (19)0 (0)0
MST 2156 (40)1 (7)5
MST 31412 (86)3 (21)4
MST 4145 (36)1 (7)1
MST 51615 (94)2 (13)3
MST 61510 (67)1 (7)10
MST 7165 (31)1 (6)1
MST 8167 (44)0 (0)0
MST 91514 (93)4 (27)8
MST 10144 (29)1 (7)10
MST 11145 (36)1 (7)1
MST 121711 (65)1 (6)2
MST 131612 (75)3 (19)6
MST 14118 (73)1 (9)1
MST 151412 (86)1 (7)1
MST 16145 (36)1 (7)1
MST 17147 (50)0 (0)0
MST 181513 (87)4 (27)8
MST 191212 (100)1 (8)2
MST 201312 (92)2 (15)2
MST 211111 (100)2 (18)8
MST 221211 (92)1 (8)1
Total314200 (64)32 (10)75
  • a The numbers and percentages of presumptive Listeria enrichment-positive samples were assessed on the basis of PALCAM plating results.