Urban Chickens

[plam]

I wonder what the impact to the economy would be if backyard birds became a continuous source of avian flu. I imagine that it would be almost impossible to control if there were thousands of chickens spread out across the region in people's backyards.
http://www.cbc.ca/news/canada/windsor/29...-1.3029870

There are thousands or millions of chickens in peoples' backyards in other countries (Turkey, for example). I was reading up on this and people kept chickens in North America until the 1950s. I'd imagine that here we'd keep a registry of urban chickens and either vaccinate or cull the chickens if there was an avian flu threat. Also, backyard birds are much less crowded than those at chicken farms.