| in the united states | 32 | location |
| in canada | 28 | location |
| in children | 17 | location |
| vaccine → be → licensed | 196 |
| vaccine → be licensed for → use | 108 |
| vaccine → be licensed for → human use | 5 |
| vaccine → be licensed for → public use | 5 |
| vaccine → be licensed for → individual | 4 |
| vaccine → be licensed for → general use | 4 |
| vaccine → become → licensed | 3 |
| vaccine → be → licenced | 3 |
| negative | neutral | positive |
| 0.212 | 0.659 | 0.129 |
| Raw frequency | 328 |
| Normalized frequency | 0.639 |
| Modifier score | 0.464 |
| Perplexity | 111.629 |