In this small case-control study within a prospective study evaluating recovery from COVID-19, although the majority of participants presented normal values in CSF for many parameters (white blood cells, glucose, CSF/serum albumin ratio, IgG index, etc.), a higher proportion of abnormal CSF findings and an abnormal oligoclonal banding pattern were detected in 77% and 69% of patients with LC and cognitive impairment versus 0% of controls, underscoring a potential abnormal autoimmune response [215]. This evidence concerns the gene ALB and COVID-19.