Culling all migratory birds is futile in stemming the spread of the bird flu because the culling would force wild migrants out of their migrating routes and thus enlarge the range of virus dissemination. |
The import of poultry or poultry products can also pass the virus and the hypothesis that wild birds are to blame is groundless. |
Theoretically the birds could not have spread the virus to the outbreak countries at the same time. |