Frank et al. [21] RT-PCR, + serology (IgG and IgM) WBC and CRP normal Negative hepatitis B and C, HIV and VDRL tests Two CSF analysis 2 weeks apart, both showing normal cell count and CSF biochemistry, negative SARS-CoV-2 PCR, negative PCR for HSV1, HSV2, CMV, EBV, VZV; Zika virus; Dengue virus and Chikungunya virus Axonal AMAN Brain: no pathological findings Spinal: no pathological findings IVIG 400 mg/kg/day (5 days) Methylprednisolone, azithromycin, albendazole Some improvement, weakness persisted