| in eliciting a response | 2 | temporal |
| for protective efficacy | 2 | purpose |
| equally | 2 | degree |
| antigen → be → effective | 4 |
| antigen → be → useful | 4 |
| antigen → be → suitable | 3 |
| negative | neutral | positive |
| 0.022 | 0.560 | 0.418 |
| Raw frequency | 11 |
| Normalized frequency | 0.290 |
| Modifier score | 1.000 |
| Perplexity | 127.946 |