Thats so sad...I remember witnessing the same types of things years ago when I was in the rabbit hobby. I raised Holland Lops and Jersey Woolys and would go along with friends to the fairs/shows. And I'm glad I did always attend them with someone who was knowledgeable enough to inform me who to stay away from and who were the reputable breeders. There was this one woman who would attend and always have at least 10 rabbits with her - mostly that was selling. She was more a rabbit hoarder than show quality breeder. I just couldn't believe they would let people in with rabbits that were sneezing, didn't look all that great and here they would be passing it on to whatever rabbits were close by. Chickens I can see being a little harder to tell whether or not they are actually sick or carrying disease other than if they are dirty, or have cloudy eyes/pasty butts - but if thats the case why on earth would they let them in?!? They should have people checking this stuff upon entry!
As I stated earlier Stress can kill chickens in that while they may appear fine, stress can trigger any underlying health problems. This can happen with anything. Adding new birds, frights, feed changes and even changes in the coop. This is why I don't let children chase my birds. Even a new person that they're not familiar with.
It's quite possible that Lou's birds were fine but the stress of being at the Fair with all the strange birds and people could have stressed them to the point they got sick. Another reason to quarantine and keep the birds calm.
I used to show guinea pigs and experienced exhibitors never took their best to the fair.
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