Hi everyone,
I'm sorry for your loss, Eurekachick. I just lost one of my gals today, suddenly and without any symptoms, just like the posting above. She was a silver-laced wyandotte named Sweet Pea. She had been completely normal and healthy this morning at 9am, but by the time it was time for everyone to come in to roost she had passed on. She was one year old.
I am cleaning out the coop, nest boxes, the litter in the run, feeder and waterer just in case I have a chance at disinfecting everything (?). I will try the antibiotics for their water too. Of course, I don't even know if it was a disease or not. She seemed very peaceful when I found her, sitting with her feet tucked under her and just relaxed under some of her favorite bushes. Anyhow, I also wanted to say thank you to everyone on this site for being so kind and sharing their stories/experience.