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Corpus document sources (200 documents)
| Document Source | Number of Documents | % of 200 |
| ProMed-Mail | 43 | 21.5 |
| Reuters | 16 | 8.0 |
| BBC | 16 | 8.0 |
| WHO | 41 | 20.5 |
| CBS | 13 | 6.5 |
| CBC | 17 | 8.5 |
| Vietnam-net | 12 | 6.0 |
| Hindustan Times | 18 | 9.0 |
| The Nation (Thailand) | 9 | 4.5 |
| All Africa | 5 | 2.5 |
| Xinhua (China) | 5 | 2.5 |
| Antara (Indonesia) | 5 | 2.5 |
