| in eight out of nine cases | 4 | temporal |
| for presence of viral genome copies | 3 | purpose |
| sample → use → qpcr | 9 |
| sample → be analyzed by → qpcr | 7 |
| sample → be subjected to → qpcr | 5 |
| sample → be used for → qpcr | 4 |
| sample → be analysed by → qpcr | 3 |
| sample → undergo → qpcr | 3 |
| negative | neutral | positive |
| 0.084 | 0.839 | 0.078 |
| Raw frequency | 31 |
| Normalized frequency | 0.318 |
| Modifier score | 0.950 |
| Perplexity | 108.006 |