inclusion criteria: - age above 18 years. - able to give informed consent. - history of documented sars-cov-2 infection either by rt-pcr or antibody test. - symptoms related to long term covid-19, defined as being investigated, diagnosed and followed by specialized infectious diseases physicians in the long term covid-19 outpatient clinic, central region of denmark, aarhus university hospital. - symptoms not attributable to other co-morbidity/condition.

inclusion criteria: - age above 18 years. - able to give informed consent. - history of documented sars-cov-2 infection either by rt-pcr or antibody test. - symptoms related to long term covid-19, defined as being investigated, diagnosed and followed by specialized infectious diseases physicians in the long term covid-19 outpatient clinic, central region of denmark, aarhus university hospital. - symptoms not attributable to other co-morbidity/condition.