I did have a Brahma recently. She had a compromised immune system, & was always getting sick, she recently picked up worms, & got really really bad. I started her on a dewormer to kill the worms, & she seemed more perky for a few days, & started eating again. Then within a day, or two she went down hill really fast. She passed away in her sleep two days ago. I guess her body was under to much stress to continue thriving.I know if they have worms incredibly bad for a long time, the worms can start to eat through the bird and kill the bird