| It is a very contagious form of influenza | 1 |
| It is a virus dropped from the laboratory | 2 |
| It is a virus from animals that has undergone a mutation | 3 |
| It is a normal phenomenon that occurs periodically in history | 4 |
| It is an excessively publicised flu | 5 |
| It is a form of biological warfare for population control | 6 |
| It is an experiment on a planetary scale | 7 |
| Something else… | 8 |