TABLE 4.
Concentration of fecal indicators and PCR presence/absence results for potential pathogens in roof-harvested rainwater samples
| Tank | Concn of fecal indicators (CFU/100 ml)
|
Pathogen presence (+)/absence (−) as detected by PCR
|
|||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| E. coli | Enterococci | C. perfringens | Bacteroides spp.b | A. hydrophila lip gene | C. jejuni mapA gene | C. coli ceuE gene | L. pneumophila mip gene | Salmonella invA gene | Salmonella spvC gene | G. lamblia β-giardin genec | |
| T1a | 5 ± 1 | 9 ± 4 | 4 ± 2 | + | + | − | − | − | − | − | − |
| T2a | 800 ± 235 | 200 ± 33 | 11 ± 3 | + | − | + | − | − | − | − | − |
| T3a | 8 ± 3 | 5 ± 3 | 31 ± 17 | + | − | − | + | + | + | − | − |
| T4a | <1 | <1 | 16 ± 9 | + | − | − | − | − | − | − | − |
| T5a | 11 ± 6 | 180 ± 27 | 3 ± 1 | + | + | − | − | − | − | − | − |
| T6 | <1 | 43 ± 9 | <1 | + | − | − | + | − | − | − | NT |
| T7 | 5 ± 3 | 125 ± 34 | 9 ± 3 | + | − | − | − | + | + | − | + |
| T8 | <1 | <1 | <1 | + | − | − | + | + | − | − | NT |
| T9 | <1 | <1 | <1 | − | − | − | − | − | − | − | NT |
| T10 | 6 ± 4 | 5 ± 2 | <1 | + | − | − | − | − | − | − | NT |
| T11 | <1 | <1 | <1 | + | − | − | + | − | + | − | NT |
| T12 | 23 ± 7 | <1 | <1 | + | − | − | + | + | − | − | − |
| T13a | <1 | <1 | <1 | − | − | − | − | − | − | − | NT |
| T14 | 74 ± 17 | 5 ± 1 | <1 | + | − | − | + | + | − | − | + |
| T15 | 11 ± 5 | 5 ± 3 | <1 | + | − | − | − | + | − | − | − |
| T16a | 350 ± 109 | 85 ± 41 | <1 | + | + | − | + | − | − | − | − |
| T17 | 7 ± 6 | 41 ± 17 | 5 ± 4 | + | − | − | − | − | − | − | − |
| T18a | 6 ± 3 | 60 ± 9 | 4 ± 2 | + | − | − | − | − | − | − | + |
| T19 | 287 ± 57 | 180 ± 40 | 8 ± 6 | + | + | − | − | + | − | − | − |
| T20 | <1 | 39 ± 7 | 29 ± 6 | + | − | − | + | − | − | − | + |
| T21 | 4 ± 3 | 28 ± 4 | 2 ± 1 | + | − | − | − | − | − | − | − |
| T22a | 5 ± 1 | 10 ± 3 | <1 | + | − | − | − | − | − | − | − |
| T23a | <1 | 45 ± 7 | <1 | + | − | − | + | − | − | − | − |
| T24 | <1 | 8 ± 3 | <1 | − | − | − | + | − | − | − | − |
| T25 | 6 ± 2 | 19 ± 5 | 3 ± 1 | + | − | − | − | − | − | − | − |
| T26 | <1 | 35 ± 11 | <1 | + | − | − | + | − | − | − | − |
| T27 | 25 ± 6 | 28 ± 7 | 6 ± 3 | + | − | − | − | − | − | − | − |
a
Tanks used for drinking water.
b
Amounts of 100-ml water samples were processed.
c
NT, not tested.