Very good advice and reminder on bio-security.
"An ounce of prevention is worth a pound of cure"
Whenever I go anywhere that has animals I have a different pair of "barn shoes" that I only wear when visiting and then wash in the washer when I get home. (Also don't wear any of the clothing I had on .. change into different clothing before going back to my own birds and sometimes even that a full bath/shower as well.
It is for my own flock's health, but it is also
courtesy to the other chicken owner. So if I ever come to visit your place, you will know that I'm not bringing something from the soils that my birds may have immunities to - but yours may not. I think that is a matter of respect for the other owners.
I don't let folks go near my chicken area if they have their own flock - unless I know that they have come with clean, unused shoes for the same reason.
I have to admit...when y'all talk about going to the swaps I have a little "cringe" sensation. I was even nervous about going in the poultry barns at the 4H fair this year as I didn't want to bring anything home. It was obvious that were sick birds there.
Even worse, people will bring sick birds to the swaps and sell to unsuspecting people just to get rid of them and make a little money. (Perhaps like the person that sold John those cockerels as pullets - there are just some people that don't seem to have a conscience.) It is unthinkable, but I know SEVERAL people that has happened to before they were educated enough to be able to spot a sick bird. And some sicknesses you couldn't tell just by looking any way.
I hope everyone is quarantining new birds before introducing into the flock! And...washing clothing and shoes before re-entering your own flocks after going to the meets. It is very important!