Furthermore, we did not observe positive SARS-CoV-2 reverse transcription PCR testing, oligoclonal bands, higher IgG indices, increased CSF IL-6 levels, nor detection of neuronal antibodies related to autoimmune encephalitis in any patient, indicating autoimmune and autoinflammatory processes, including viral CNS infection, were unlikely to be involved in the pathogenesis of the present cases. Here, IL6 is linked to autoimmune encephalitis.