Depends on how old and where you are keeping them. If they are chicks that have been inside and you keep them inside, the risk is limited, especially if you wash and change clothes before tending them.I solved my problem but it wouldnt hurt to ask in case the same problem in the future arise.
How often would you say its possible for one owner to take juvenile chicks and chickens for couple of days while the other owner is out? More like “chicken sitting”. I know the whole repercussions of making sure the chickens must be quarantined for a month.
If this is a close neighbor and you visit often, you probably already share chicken germs, so the risk has already been taken.
When infection happens, it is quick and devistating. That being said, you can be super careful and still have a wild bird deliver a nasty virus to your flock.
Swapping chickens is taking a chance... but so is going to the feed store or a poultry show or any place that has chickens. Most times it's okay, but depends on how much you want to push your luck, I guess.