Is a jo-1 antibody is common in fibromyalgia?

No. The jo-1 antibody can be associated with a form of polymyositis which is an autoimmune inflammatory muscle disease. Fibromyalgia is a very painful condition in which muscles, ligaments, and tendons are highly sensitive and can hurt but the condition is neither autoimmune nor inflammatory.
No. The jo-1 antobody is seen in some people with an autoimmune condition that affects the muscles. Fibromyalgia is not thought to be an autoimmune disorder . If the jo-1 antibody is positive, this would argue against the diagnosis of fibromyalgia. There are no tests for fibromyalgia.