Myasthenia gravis (MG) is an autoimmune disease characterized by muscle weakness caused by antibodies targeting acetylcholine receptors (AChRs) or muscle-specific kinases (MuSK). Double-seropositive MG (DSP-MG) caused by both antibodies is rare. We herein report a 78-year-old woman who developed DSP-MG after COVID-19 infection. She presented with neck muscle fatigue and upper-limb weakness. Elevated levels of anti-AChR and anti-MuSK antibodies were detected. The patient responded well to the immunosuppressive therapy. This case highlights the potential for various autoimmune neurological conditions post-viral infection and the significance of prompt recognition and treatment.
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