Most, if not all, of my 16-week old chickens are sneezing, wheezing, or rattling. I have 6 that prefer hanging out in the coop. The Brabanters that I just integrated do not have symptoms but may have been carrying something that these 16-wk old chicks aren't immune too because they really don't wander out of the coop. I'm going to do my best to boost them up. Any recommendations welcome.
Edited to add: Kicked almost everyone out of the coop. It's too nice out for them to be playing in litter. Hoping it gets them breathing better.
If the sneezing & wheezing was happening in my coop, id find an antibiotic to give them. Durvet or liquimycin are available at tractor supply. Good idea to get them out in this beautiful weather. Maybe I'd pull out all old shavings & replace w fresh new ones. Well wishes to u & ur chickens!