TABLE 1.
Legionella contamination in hot and cold water samples examined
| Organism | No. of samples/total (%)
|
|||||||
|---|---|---|---|---|---|---|---|---|
| Hot water samples
|
Cold water samples
|
|||||||
| Positive | With 500-999 CFU liter−1 | With 103-9,999 CFU liter−1 | With ≥104 CFU liter−1 | Positive | With 500-999 CFU liter−1 | With 103-9,999 CFU liter−1 | With ≥104 CFU liter−1 | |
| Legionella spp. | 260/962 (27.0) | 89/260 (34.2) | 131/260 (50.4) | 40/260 (15.4) | 8/124 (6.4) | 3/8 (37.5) | 5/8 (62.5) | 0/8 (0.0) |
| L. pneumophila serogroup 1 | 120/962 (12.5) | 42/120 (35.0) | 59/120 (49.7) | 19/120 (15.8) | 1/124 (0.8) | 0/1 (0.0) | 1/1 (100.0) | 0/1 (0.0) |
| L. pneumophila serogroups 2-14 | 117/962 (12.2) | 38/117 (32.5) | 61/117 (52.1) | 18/117 (15.4) | 3/124 (2.1) | 1/3 (33.3) | 2/3 (66.7) | 0/3 (0.0) |
| Legionella spp. other than L. pneumophila | 32/962 (3.3) | 19/32 (59.4) | 10/32 (31.2) | 3/32 (9.4) | 4/124 (3.2) | 2/4 (50.0) | 2/4 (50.0) | 0/4 (0.0) |