Examination of the prevalence of thrombosis in COVID-patients, especially in an out-patient setting. Assessment by duplex sonography. If thrombosis is detected, we will correlate it with immunity status. Assessment of health issues and cognitive function as late complication after infection.

Inclusion Criteria:

• SARS CoV 2 positive swap, at least 4 weeks after infection

Exclusion Criteria:

• under 18 years old no consent anemia

all SARS CoV 2 positive patients registered at local health departments (Augsburg) are invited to join the study

data as pseudonyms