| during their hospital stays | 3 | temporal |
| for 2 to 3 weeks | 2 | temporal |
| virus → be found in → urine | 21 |
| virus → be present in → urine | 11 |
| virus → be found in → rodent urine | 5 |
| virus → be detected in → urine | 4 |
| virus → be present in → the urine | 4 |
| negative | neutral | positive |
| 0.709 | 0.278 | 0.013 |
| Raw frequency | 45 |
| Normalized frequency | 0.483 |
| Modifier score | 0.400 |
| Perplexity | 65.812 |