| Typicality: | 0.692 |
| Saliency: | 0.826 |
| largely | 100 | degree |
| because of the increasing variety of strains | 8 | cause |
| to date | 6 | temporal |
| mechanism → remain → unknown | 321 |
| mechanism → remain → undetermined | 11 |
| mechanism → remained → unknown | 8 |
| mechanism → remain → unidentified | 4 |
| negative | neutral | positive |
| 0.246 | 0.711 | 0.043 |
| Raw frequency | 344 |
| Normalized frequency | 0.826 |
| Modifier score | 0.775 |
| Perplexity | 208.575 |