This may be long but please read, I would like any and all input. I had 2 chickens and 1 rooster that are almost 8 years old, One became ill and I thought it might be due to old age, she lost her body weight and got real weak. I got her antibiotics, and probiotics, and electrolyes. she got worse and died, time from weight lost to death, approx 4 weeks. then my rooster became ill, same symtoms, extreme weight lost but no loss of appetite,until the end. took him to vet got almost everything and anything you can think of in the way of meds, although he really didnt know what was wrong. he died, 1 hen left, same symtoms, feather weight could blow away, eating like crazy and dropping to nothing. used meds I had left from rooster but when one more step and wormed her with ivermectin, she snapped out of it and gained all her weight and then some. none of these chickens had any sign of cold, since she made it I went and got a young rooster, wormed him when he got to the place as he seems thiner than I like had him 4 months then the same symtoms hit him, extreme weight loss, staggering and weak.I wormed him, got him took him to the vet got him meds, his comb was pale and his face yellowish, he never stopped trying to survive and he never stopped eating like the other two, other than that same old thing, I guess I had a disease of some sort at my place, Im left with one lonesome chicken I dont dare bring anything else there to die. does anyone have any ideals at all ? could it be some kind of worm the meds are not getting, I have wazine and ivermetic, My heart is broken as there were just my pets and Mr Brown who died last night was such a baby he set in my lap all the time. I cant imagine how this old hen snapped out of it, the others had the same meds she did and died.please give me your thoughts whatever they may be. this vet tries but hes not an avian vet, I dont think we have an avian vet in this state.