If a producer knows his animals well, how many days will it take him to notice Avian flu in his building? Given how quickly this flu spreads, if he doesn't realize that it is there soon enough and if he is moving from building to building, then he will end up contaminating all his animals. If he has 10 poultry buildings, he will contaminate the whole flock.
On May 10th, 2007. See this statement in context.