| Typicality: | 0.403 |
| Saliency: | 0.359 |
| every year | 19 | temporal |
| annually | 7 | temporal |
| due to antigenic drift | 3 | cause |
| vaccine → be → reformulated | 31 |
| vaccine → be → redeveloped | 8 |
| vaccine → be → redesigned | 3 |
| negative | neutral | positive |
| 0.212 | 0.682 | 0.106 |
| Raw frequency | 42 |
| Normalized frequency | 0.359 |
| Modifier score | 0.500 |
| Perplexity | 293.263 |