I’m so sorry to hear that TillyPeeps. My flock has been fighting the same respiratory illness for 3 years. It’s not from Dennis, his birds got it when they came here. It’s not Newcastle, influenza, or any of the fast killers, I’m thinking it’s some kind of Mycoplasma but they don’t respond to antibiotics at all. However, the 3rd generation chicks are doing great, and although we had a few sniffles early on they seem to have much more resistance to the disease, whatever it is. Marans seem to be particularly susceptible, which is awful because it’s one of my favorite breeds, and Tiger fought it for over a year before he died. What a sweetheart, it really hurts going out to the pen at dusk and not finding him waiting for me.