Looking for advice: I have a 6 month old buff, she is showing signs of extreme respiratory illness and I'm looking for guidance. We recently had one hen necropsied. Showed signs of CRD. she came back positive for MS/MG, and a fungal infection. I spoke to the pathologist and she said the fungal is uncommon in birds older than 2 weeks. It's likely from an infection she had earlier in life. Moving on. I have decided not to cull, and to keep flock closed. Yesterday my BO showed signs of distress. Wouldn't get off of roost. When I came home from work, she was still there and looked worse. I isolated her. Gave fluids with nutra drench. She's drinking but I have to spoon feed the water.....She has seemed to perk up a little. Especially since last night. I expected her to pass in the night. This am she seems a little better. She is wheezing a little. But only when I approach, as if she's whining at me. I've misted with vet Rx. This am I was able to get her to eat some food mashed up in water. A little background... They were recently treated with tylan, and ponazural. The tylan was two weeks ago, the ponazural ended Saturday. The tylan started after the first bird(now deceased) started to show symptoms. The ponazural was a precaution because deceased bird had blood in stool so was assumed to have cocci, due to weak immune from the respiratory illness.... I realize this is part of dealing with CRD, my concern is... As I'm researching I'm reading about fungal infections presenting as CRD. I use sand in coop and it is dry. We do however have them in a free range garden area. We have wood chips down. Could this be contributing to the fungal infection? My husband is convinced. I'm dismayed ..... Any ideas would be appreciated. I know this is info overload but figured more info is better. Would appreciate any thoughts as well as advice on how to treat. This is my favorite girl and I really want her to pull through.