Table 3 Distribution of Legionella spp. by concentration (cfu/L) according to chlorination stages
< 102 cfu/L | > 102 < 103 cfu/L | > 103 cfu/L | Total | |
|---|---|---|---|---|
Before hyperchlorination | 9 (4.4%) | 21 (10.3%) | 13 (6.4%) | 43/204 (21.1%) |
15 days after hyperchlorination | 8 (4.1%) | 2 (1.0%) | 5 (2.6%) | 15/193 (7.8%) |
30 days after hyperchlorination | 0 | 4 (2.3%) | 2 (1.2%) | 6/173 (3.5%) |
Continuous hyperchlorination | 8 (1.9%) | 5 (1.2%) | 10 (2.4%) | 23/416 (5.5%) |
No continuous hyperchlorination | 13 (23.6%) | 2 (3.6%) | 0 | 15/55 (27.3%)* |
Total | 38 | 34 | 30 | 102 |