Table 4.
Ct values and estimated numbers of genomes of enteric viruses per milliliter of water in untreated and treated sewage samples from three weeks in 2015, where K numbers indicate the internal sample numbers.
| Virus | Week 49 |
Week 50 |
Week 51/52 |
||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| K399 | K400 | K401 | K402 | K416 | K417 | K418 | K419 | K462 | K463 | K464 | K465 | ||
| Inlet sewage |
Conven-tionally treated | Ozone treated |
Outlet after dam | Inlet sewage |
Conven-tionally treated | Ozone treated |
Outlet after dam | Inlet sewage | Conven-tionally treated | Ozone treated |
Outlet after dam | ||
| Adenovirus | Ct value | 27.1# | 34.7 | 30.6 | 36.0 | 33.0 | 34.4 | 35.6 | 36.7 | 32.1 | 36.9 | 40.3 | 39.7 |
| Viral genomes/mL | 260,000 | 1300 | 24,000 | 530 | 4200 | 1600 | 720 | 330 | 7900 | 290 | 27 | 40 | |
| Norovirus GI | Ct value | 30.0 | -* | – | – | 35.6 | – | – | – | 29.7 | – | – | – |
| Viral genomes/mL | 36,000 | – | – | – | 730 | – | – | – | 43,000 | – | – | – | |
| Norovirus GII | Ct value | 29.1 | 36.5 | 39.1 | 38.3 | 32.1 | 38.6 | – | – | 28.9 | 36.1 | – | 38.7 |
| Viral genomes/mL | 65,000 | 390 | 61 | 11 | 8400 | 88 | – | – | 76,000 | 50 | – | 80 | |
| Sapovirus | Ct value | 26.6 | – | – | – | 31.4 | – | – | – | 27.1 | – | – | – |
| Viral genomes/mL | 380,000 | – | – | – | 14,000 | – | – | – | 270,000 | – | – | – | |
| Parechovirus | Ct value | 33.6 | – | – | – | 35.3 | – | – | – | 35.4 | – | – | – |
| Viral genomes/mL | 2800 | – | – | – | 850 | – | – | – | 780 | – | – | – | |
| HEV | Ct value | – | – | – | – | – | – | – | – | 39.6 | – | – | – |
| Viral genomes/mL | – | – | – | – | – | – | – | – | 45 | – | – | – | |
| Astrovirus | Ct value | 28.8 | – | – | – | 25.3 | – | – | – | 25.0 | 37.5 | – | – |
| Viral genomes/mL | 81,000 | – | – | – | 960,000 | – | – | – | 1,100,000 | 180 | – | – | |
#: mean Ct value (Ct = cycle threshold in the quantitative PCR).
*: Undetected.