| under the trade name | 3 | other |
| in china | 2 | location |
| vaccine → be made by → merck | 18 |
| vaccine → be manufactured by → merck | 16 |
| vaccine → be produced by → merck | 8 |
| vaccine → include → merck | 4 |
| vaccine → be sold by → merck | 3 |
| vaccine → be marketed by → merck | 3 |
| negative | neutral | positive |
| 0.181 | 0.612 | 0.206 |
| Raw frequency | 52 |
| Normalized frequency | 0.388 |
| Modifier score | 0.800 |
| Perplexity | 87.906 |