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FIRST thing I would do is STOP introducing ANY NEW birds to an already contagious, diseased area! The young ones will die of the infection and those left will just keep passing it around. ISOLATE ALL who seem the worst and be aggressive in their treatment, also treat the rest of the flock according to age and size at the same time.
Next, you need to get the right antibiotic into their water supply and make SURE it is getting into any and ALL the birds.
Serperate the younger birds to prevent overdosing and continued cross contamination and re-infection.
It WILL keep going around and around until you deal with this in an extreme manner.
If you are changing the water that often, are you replacing the medication as well?
It can take more than 3 months to completely clear up a respritory infection in an entire flock. You MUST get an aggressive treatment plan enacted, otherwise you might as well kill the whole flock now and start over.
Im sorry I cant reccomend a specific antibiotic by name- the one time a few of my flock got a respritory ailment, I used this yellow powder that pours into their water supply. I was NOT fast enough, nor thorough enough, and it took me 5 months and 2 dead hens to finally treat and cure my flock. That was almost 2 years ago though. I learned my lesson then of the importance of isolating new poultry. I will never bring any new chickens into my flock again- its hatching eggs only for me now.
I hope you can get your flock better soon- its such a bad feeling when they are sick and you keep trying and trying and it never seems to get better. Just keep trying and get aggressive with treatment. Maybe call a vet for advice on medications?
BTW, dont eat their eggs while they are being medicated.