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Once a virus gets into an intensive poultry shed it can move quickly through the flock, constantly replicating itself. Any "errors" or changes to the genetic code during replication don't get repaired: this is how the virus mutates and new variant strains emerge. The tragedy is that while intensive farms provide ideal conditions for the emergence of new aggressive disease strains, wild birds can then become infected too. Experience from the 2005 outbreak of highly pathogenic avian influenza H5N1 suggests that the disease is more likely spread along major road and rail routes than on the flight routes of migratory birds. (en) |
