| in humans | 2 | other |
| virus → cause → west nile | 12 |
| virus → cause → west nile fever | 10 |
| virus → cause → west nile infection | 4 |
| virus → cause → west nile disease | 3 |
| negative | neutral | positive |
| 0.763 | 0.225 | 0.012 |
| Raw frequency | 29 |
| Normalized frequency | 0.405 |
| Modifier score | 0.500 |
| Perplexity | 113.358 |