| currently | 7 | temporal |
| without certain ingredients | 7 | other |
| well | 6 | degree |
| vaccine → be → studied | 78 |
| vaccine → be → investigated | 22 |
| vaccine → be → researched | 21 |
| vaccine → be → study | 7 |
| vaccine → be under → study | 6 |
| vaccine → be under → investigation | 5 |
| vaccine → be → investigational | 4 |
| negative | neutral | positive |
| 0.251 | 0.559 | 0.190 |
| Raw frequency | 143 |
| Normalized frequency | 0.526 |
| Modifier score | 0.600 |
| Perplexity | 162.890 |