Inclusion Criteria:  Mild, moderate and severe COVID 19 cases will be included in our study. Either diagnosed by polymerase chain reaction (PCR), CT changes characteristic of COVID 19 infection or by symptomatology and laboratory investigations.  Either managed as an outpatient or admitted to hospital. Either admitted to ward or to ICU. Age above 18 years old. With no history of end stage organ failure. With no history of neurological, psychiatric disease or cerebrovascular insufficiency.  Exclusion Criteria:  Age below 18 years old. End stage organ failure. Patients with neurological, psychiatric diseases and cerebrovascular insufficiency.