I recently had some chickens showing CRD symptoms (about 2 weeks ago). 2 were sneezing and had raspy breath, but no runny nose or watery eyes. They were separated and given tylan injections. 2 seemed like they were having trouble breathing but when I listened to their lungs they didn't sound congested and were allowed to stay with the rest of the flock outside. The 5 chickens outside were all given oral antibiotics. 3 chickens never showed any signs of illness. All are back to normal and happy. My question is can these 3 chickens that never showed any symptoms safely be rehomed (which was my original plan for them as they got older). Or would that potentially put someone else's flock at risk and all should eventually be culled?