They are in the fact that children and adults will not be running through their coop or run, getting poop on their shoes then potentially tracking that into a house. And commercially raised chickens don't get kissed upon like backyard chicken pets. They might be pets to some people, but they...
Those news articles and stories come out every year. They tell people not to get backyard chickens or if you have them, not to kiss them, blah blah blah. It's been a scare tactic for awhile now