I have a white leghorn (Betty White) who I've had for almost 3 years. She had a bacterial infection early last (February) year in her ovum duct that caused her to no longer lay. A few months later (July) she had a (chicken cold) and was given an antibiotic. Then in October to have a severe bacterial infection (lime green stool) and bumble foot and was given Tylen injections. She stayed inside my home until December to heal and not be around my other hens. She now has the bacterial infection again! Does anyone have any advice on how to treat her to get her healthy or am I fighting a loosing battle? The vet said she is just prone to be the "sick" one.