Introduction: Guillain-Barré syndrome is an acute/subacute set of clinical features of immune mediated polyradiculoneuropathy, typically after respiratory or gastrointestinal viral infection. In this scenario, we described a case of the syndrome mentioned after infection by sars-cov-2 virus. Objectives and Methods: Description of a clinical case after analysis of medical history and complementary exams, in addition to literature review. Design and Setting: Case report, type of descriptive study, developed in the Institute of Medical Assistance to the State Public Servant of São Paulo. Results: A 68-year-old female patient with clinical and laboratory diagnosis of coronavirus infection, hospitalized in need of oxygen supplementation, which evolved after twelve days of symptoms with hypoesthesia on legs and feet and progressively ascending and symmetrical flaccid paraparesis that led to tetraparesis. Neurological examination showed tetraparesis (muscle strength: grade III in MMSS and grade II in MMII), hyporeflexia in MMSS and reflexes abolished in the lower limbs, plantar skin reflex in flexion in both feet, preserved facial mimicry. About complementary tests, it presented cerebrospinal fluid with albuminocytologic dissociation (cell: 1, protein: 89, glucose: 86), RT-PCR for sars-cov-2 research in cerebrospinal fluid, inconclusive, in addition to four-limb electroneuromyography performed after 19 days of onset of neurological condition, indicated polyradiculoneuropathy with involvement of sensory and motor fibers, primarily demyering. Treatment with human immunoglobulin 400 mg/kg/day for 05 days was started. The reported patient was dismissed from the hospital with significant improvement, presenting muscle strength: grade V in MMSS and grade IV in MMII and already with the ability to walk. Conclusions: the case describes a classic neurological complication associated with a virus that was once non-circulating, but currently with a big clinical relevance.
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