I am posting this on behalf of a friend. She recently bought some baby chicks and they are dying. They seem to have difficulty breathing, get really weak, and can't stand. They appear to have seizures, and then die. Some die suddenly and some die slowly. One I saw today was walking okay, but every time it would take a breath, it's mouth would open wide, like it was peeping, but no sound came out. It kept shaking it's head. Another one got weak and appeared to have a seizure. It seemed fine a couple of minutes later. Then it had another "seizure" and died suddenly. She has had chicks die from this in the past, but she's not sure what it is, or if she can get rid of it. Any advice?