| to become effective | 21 | purpose |
| unfortunately | 2 | manner |
| vaccine → take → time | 28 |
| vaccine → require → time | 3 |
| vaccine → need → time | 3 |
| negative | neutral | positive |
| 0.237 | 0.617 | 0.146 |
| Raw frequency | 34 |
| Normalized frequency | 0.330 |
| Modifier score | 0.700 |
| Perplexity | 88.266 |