| under the immunization programme | 2 | other |
| vaccine → contain → pertussis | 24 |
| vaccine → include → pertussis | 15 |
| vaccine → be → pertussis | 7 |
| vaccine → contain → pertussis antigens | 5 |
| vaccine → be → the pertussis | 3 |
| negative | neutral | positive |
| 0.485 | 0.476 | 0.039 |
| Raw frequency | 54 |
| Normalized frequency | 0.393 |
| Modifier score | 0.825 |
| Perplexity | 155.261 |