I got a budgie from a pet store I worked with, his health was so bad they left him in the back unattended too. I took him in along with 1 others in his cage.
He was severely underweight. 25g I took him to an avian vet, and they diagnosed him with avian gastric yeast infection. No cure to it they said. They gave me FS10 to add to his water which is disinfectant/safe bacterial killer and ingestable, however my budgie did pass away while Still losing weight at 21g.
The other one is alive but currently at that battle I had with my previous, i take him to the vet every second to third week, his weight was okay for that past 6 months, he does have the same disease as it's highly contagious to birds. But he is now losing weight, from 37g to 31g in 2 weeks. Any advise to help gain his weight
The disease basically doesn't let food nutrition digest and therefore they lose weight as their body isn't getting the food it eats and overall die, that's all I know from the vet, no cure known, their last resort to attempt would be amohotericin b which is extremely expensive and they aren't sure the bird would make it regardless as it's a toxic medication but could kill the bacteria.
The budgie that didn't make it was scheduled the medication the day after his death but didn't get to attempting it. Any advise at all would be advisable. I'm super stressed out.