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Incidence of SARS-CoV-2 antigen-positive nasal turbinates and antigen scores. NA, no antigen-positive cells detected in any of the ferrets at the respective time points; Antigen scoring system: 1, less than 50 positive cells per section; 2, 50–100 positive cells per section; 3, > 100 positive cells per section.
| Day p.i | Number of antigen-positive ferrets (n = 4 per time point) | Antigen score of ferrets (1, 2 or 3) |
|---|---|---|
| 3 | 3/4 | 2, 1, 2 |
| 5 | 4/4 | 1, 1, 1, 1 |
| 7 | 3/4 | 1, 1, 2 |
| 9 | 0/4 | NA |
| 14 | 0/4 | NA |
