Volume 30, Number 3—March 2024
Research
Wastewater Surveillance for Identifying SARS-CoV-2 Infections in Long-Term Care Facilities, Kentucky, USA, 2021–2022
Table 2
SARS-CoV-2 case clusters and associated wastewater signal characteristics at 4 long-term care facilities, Kentucky, USA, 2021–2022*
Characteristic | Facility |
|||
---|---|---|---|---|
B | C | C | D | |
Case cluster | ||||
No. residents infected | 14 | 10 | 7 | 4 |
Duration, d |
15 |
47 |
24 |
13 |
Wastewater signal | ||||
Period since previous positive signal, d | 6 | 5 | 6 | 23 |
Magnitude of previous signal, genome copies/mL | 250.7 | 29.8 | 177.9 | 6.8 |
Signal on day of initial positive clinical test, genome copies/mL | 208.1 | NA | 53.5 | NA |
Time from initial case to positive signal, d | 0 | 2 | 0 | 12 |
Signal range, genome copies/mL | 0–467 | 0–663 | 0–687 | 0–39 |
Fraction of samples with SARS-CoV-2 detected | 6/8 | 12/26 | 8/13 | 1/4 |
*Case clusters were defined as >1 resident testing positive for SARS-CoV-2 within 14 d at the same facility. Two clusters occurred at the same facility at different time points. NA, not applicable because no wastewater sample collected that day.
1Current affiliation: WWAMI School of Medical Education, University of Alaska Anchorage, Anchorage, Alaska, USA.
2Current affiliation: College of Medicine, University of Cincinnati, Cincinnati, Ohio, USA.