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SARS-CoV-2 live virus limit of detection.
| Viral dilution tested | Positive results/replicates | ||||
|---|---|---|---|---|---|
| TCID50/ml | TCID50/Swab | USA-WA1/2020 | USA-CA3/2020 | Italy-INMI1 | USA-GA4/2020 |
| 7.5 × 105 | 1.5 × 104 | 3/3 | n.t | n.t | n.t |
| 7.5 × 104 | 1.5 × 103 | 5/5 | 3/3 | 3/3 | 3/3 |
| 3.8 × 104 | 7.5 × 102 | 5/5 | 3/3 | 3/3 | 3/3 |
| 1.9 × 104 | 3.6 × 102 | 0/5 | 3/3 | 2/3 | 3/3 |
| 9.4 × 103 | 1.8 × 102 | n.t | 3/3 | 0/3 | 2/3 |
| 4.7 × 103 | 9.4 × 101 | n.t | 3/3 | n.t | 0/3 |
| 2.3 × 103 | 4.5 × 101 | n.t | 0/3 | n.t | n.t |
TCID50 50% tissue culture infectivity dose, n.t. not tested.
