Ok so my flock is about 50 deep. In that 50, is a set of 5 broilers, about 3.5 months old. For the past month. I have noticed some "silent gasping" in them. Checked them for gape worms, didn't see much (I know you can't always see them.) But then I noticed them randomly sneezing, and one of the hens comb is quite pale/purple in color. So do I think I have gape worms or a resp disease? NO OTHER BIRDS have ANY symptoms! Just these 5 broilers. It's been about a month since I noticed the start of the random gasping. And if I don't figure it out, can I even still eat them? It's almost cull time for them. So frustrating. Thoughts?