That's awesome ! I am so glad that they are getting better for you Maybe in a week or so they'll be laying eggs for you again !
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I know there are spirochetes that can infect chickens in different parts of the body. The Red Chicken mite can be a source...but I dont know specifically what they attack in the system. Inspect your birds for mites. In other words, what was the source/cause of the spirochetes and how to prevent further infections? Perhaps the vet would know.
You can go out to the coop at night with a flashlight and have a look-see. You should be able to see mites crawling around on roosts/nests/chicken legs and feet if they're present.