Myalgic Encephalomyelitis/Chronic Fatigue Syndrome: First Described Complication after Gam-COVID-Vac Vaccine.

Background: Myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS) is a severe, debilitating chronic disease characterized by marked tiredness and fatigue, cognitive dysfunction, sleep disturbances, pain, and autonomic, immunological, and metabolic dysfunctions, in which all symptoms are usually exacerbated by physical and/or psychological stress.

Subjects And Methods: We report a case of ME/CFS with severe myalgia and severe locomotor disorders in a 25-year-old female after Gam-COVID-Vac vaccine (Sputnik V) ten days before the manifestation of the symptoms.

Results: This is the first report of such a complication from the Gam-COVID-Vac vaccine.