You “can” bring home a disease or maybe a parasite for your chickens if you go to chicken swaps or auctions, even if you don’t take a chicken home. A lot of things “can” happen. You can have a fender bender the next time you drive to the store. A piece of space junk can fall out of the sky and hit your home. The sun can shine today.
Some are more likely than others, some you have more control over than others. If you don’t wear the same clothes and shoes around your chickens that you wear to the auctions or swaps you greatly decrease your chances of bringing anything home. It’s unlikely you would bring anything home anyway but it’s really unlikely if you change your shoes. This is one you do have a lot of control over. It’s not one to be scared of.
Some are more likely than others, some you have more control over than others. If you don’t wear the same clothes and shoes around your chickens that you wear to the auctions or swaps you greatly decrease your chances of bringing anything home. It’s unlikely you would bring anything home anyway but it’s really unlikely if you change your shoes. This is one you do have a lot of control over. It’s not one to be scared of.