| commonly | 8 | degree |
| before appearing in the u.s. | 3 | temporal |
| previously | 2 | temporal |
| virus → be found in → europe | 18 |
| virus → occur in → europe | 5 |
| virus → be seen in → europe | 3 |
| virus → be present in → europe | 3 |
| negative | neutral | positive |
| 0.475 | 0.486 | 0.039 |
| Raw frequency | 29 |
| Normalized frequency | 0.405 |
| Modifier score | 0.820 |
| Perplexity | 74.630 |