| potentially | 4 | degree |
| in 1957 | 3 | temporal |
| only influenza | 3 | other |
| virus → cause → pandemic | 52 |
| virus → trigger → pandemic | 9 |
| virus → cause → the pandemic | 6 |
| virus → create → pandemic | 5 |
| virus → spark → human pandemic | 4 |
| virus → start → pandemic | 4 |
| virus → cause → the 2009 pandemic | 3 |
| virus → lead to → pandemic | 3 |
| virus → set off → pandemic | 3 |
| negative | neutral | positive |
| 0.670 | 0.279 | 0.051 |
| Raw frequency | 89 |
| Normalized frequency | 0.605 |
| Modifier score | 0.650 |
| Perplexity | 31.003 |