Table 1.
SARS-CoV-2 RNA results of the 60 surface samples taken on 24 and 25 June 2021 from the meat processing plant following an outbreak.
| RT-PCR Results (From a Total of 60 Samples) |
Level of RNA (Based on Ct Value) |
||||
|---|---|---|---|---|---|
| Confirm Positive |
Suspected Positive | Negative | Moderate-High (Ct < 32.0) | Low (Ct 32.0–34.9) | Very Low-None (Ct ≥ 35.0 a) |
| 1 (1.7%) | 6 (10.0%) | 53 (88.3%) | 0 (0.0%) | 1 (1.7%) | 59 (98.3%) |
| Positive sample information | |||||
| Site area | Location in area | Mean Ct value b | Estimated copies per cm2 c | ||
| Engineering | Toolbox cupboard-door and 2 shelves | 34.0 | 1007 | ||
| Engineering | Toolbox cupboard-top of cupboard | 37.9 d | 40 | ||
| Engineering | Tool drawers | 36.5 d | 240 | ||
| Chiller 1 | OCM screen | 37.9 d | 14 | ||
| Mission control | Dehumidifier | 38.0 d | 34 | ||
| Smoking shelter |
Chair | 37.5 d | 102 | ||
| Canteen | Table top and seat | 37.7 d | 38 | ||
a Includes 53 samples with no SARS-CoV-2 RNA detected. b Mean Ct value for the N gene. c Extrapolation from copies per reaction to copies per sample collected based on the dilution factor, then divided by recorded sampling area. d Sample identified as suspected positive, defined as a sample with a single replicate testing positive for at least one target. The detection limit defined by the manufacturer was Ct 38.0. Abbreviations: Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), Ribonucleic acid (RNA), Real-time polymerase chain reaction (RT-PCR), Crossing threshold (Ct) and Nucleocapsid (N).