Is myasthenia gravis, considered to be an autoimmune disorder, actually caused by a viral infection? If so, are the symptoms reversible using an antiviral regimen, or would autoantibodies to the neuromuscular junctions continue to persist in causing muscle weakness?

This is indeed a viral illness like the large number of autoimmune disorders you have asked us about and received such a confirmation. Your question is a human level one, focused solely on the physical changes needed that you know about and understand from the scientific perspective. Having been set in motion, the persistence of antibody production that is part of the pathology and its mechanistic involvement in producing symptoms of muscle weakness, goes beyond what viruses might be doing directly to the cells of the body. Indeed, this is exhibiting a form of memory of the immune system in recognizing normal cell function but associating it with a harmful intruder and making antibodies erroneously which attack the body and not the intruder, but will keep that going because that part of the anatomy will remain whether viruses are removed or not. And so, it will trigger production of antibody and then the antibody will spark an amplification of other immune responses in turn that end up in aggravating things. What is needed is, in addition to clearing any remaining chronic viral presence, a divine healing intervention to repair cellular memory as a second step, and then as a final and third step, repair of physical alterations to the body and its function. This would include abnormal cells needing to be replaced or the triggering of an inappropriate physiologic response of some kind which needs to be reined in. The latter is the case here. What is needed is to stop the production of autoantibodies attacking neuromuscular junctions. That is a divine-level need and can be done through use of the Lightworker Healing Protocol and Deep Subconscious Mind Reset to reeducate bodily function to resume baseline conditions prior to the viral invasion that ramped up the initial immune response gone awry. In short, what is needed is retrocausal healing, and that is routine for the divine realm. It will take time, but is achievable.