Hello all, I have been raising chickens for about 3 years with my boyfriend - this is a learning process for us. To be perfectly frank, we did not employ good biosecurity when we added to our flock about 2 years ago. This spring, I noticed a legbar wheezing. She was fine otherwise. I separately her for a few days and fed her bread with olive oil, the wheezing stopped and she went back to the rest of the flock. I notice now that the girls who came from the addition have pale combs almost like they have a dust layer over them and that some of them wheeze particularly at nighttime. This is about half of my flock. Otherwise they are not lethargic, eating drinking well, and put up a vigorous fight when we try to catch them. There is no discharge or signs of coccidio. There is no nasal discharge, eye discharge, or cough/sneezing. I have checked them for gapeworm. They were recently treated for chicken lice with spray on permethrin but this has been going on since before that. I’ve never felt wormed them. I suspect mycoplasma but I’m not sure if it is. I understand that this can become a chronic respiratory disease like COPD in humans (I’m a nurse practitioner) and it can flare in times of viral infections or stress. What can I do for them? It’s been a few weeks. Do I separate them and treat with abx? Or do they likely have CRD at this point and it’s all supportive? Thank you