Table 3.
Opportunistic-pathogen survey of drinking water distribution system PCF
| Target organism | Occurrence rate (%) |
Concn (± SD) |
||||||
|---|---|---|---|---|---|---|---|---|
| Highest |
Avg for positive samples |
|||||||
| Sites (n = 15) | Samples (n = 80) | Water (n = 54) | Biofilm (n = 26) | Water (no. of gene copies/ml) | Biofilm (no. of gene copies/swab) | Water (no. of gene copies/ml) | Biofilm (no. of gene copies/swab) | |
| Legionella spp. | 100 | 67.5 | 83.3 | 34.6 | 759.6 ± 285.7 | 1.5 × 106 ± 1.8 × 105 | 100.8 ± 184.2 | 2.2 × 105 ± 4.7 × 105 |
| L. pneumophila | 20 | 5.0 | 5.6 | 3.8 | 219.4 ± 23.8 | 1.9 × 104 ± 1.1 × 104 | 90.4 ± 111.9 | 1.9 × 104 |
| Mycobacterium spp. | 100 | 93.7 | 98.1 | 84.6 | 2.1 × 104 ± 4.2 × 103 | 2.9 × 107 ± 8.1 × 105 | 1.4 × 103 ± 3.5 × 103 | 3.8 × 106 ± 8.1 × 106 |
| M. avium | 33.3 | 10 | 11.1 | 7.7 | 850.1 ± 458.7 | 4.3 × 105 ± 3.9 × 104 | 38.4 ± 166.1 | 9.1 × 104 ± 1.9 × 105 |
| H. vermiformis | 73.3 | 28.7 | 29.6 | 26.9 | 5.1 × 103 ± 2.2 × 102 | 4.6 × 106 ± 2.3 × 105 | 781.7 ± 1,408.0 | 1.8 × 106 ± 1.9 × 106 |
| Acanthamoeba spp. | 6.7 | 1.25 | 0 | 3.8 | N/Aa | 3.0 × 104 ± 5.2 × 104 | N/A | 3.0 × 104 |
| P. aeruginosa | 13.3 | 5.0 | 5.6 | 3.8 | 700.3 ± 158.7 | 5.3 × 104 ± 5.5 × 103 | 340.6 ± 363.0 | 5.3 × 104 |
a
N/A, not available.