| each year | 5 | temporal |
| based on international surveillance | 3 | other |
| quickly | 3 | manner |
| virus → can → change | 17 |
| virus → could → change | 6 |
| virus → be able to → change | 5 |
| virus → be likely to → change | 3 |
| negative | neutral | positive |
| 0.408 | 0.542 | 0.050 |
| Raw frequency | 31 |
| Normalized frequency | 0.417 |
| Modifier score | 0.700 |
| Perplexity | 444.438 |