Inclusion Criteria:  Participants eligible for inclusion in this study for the exposed cohort with a diagnosis of COVID-19 in the last 6 months must meet all of the following criteria:  Aged 18 years or older; Positive result on a rapid Ag test or PCR for SARS-CoV-2 for Covid-19 compatible symptoms a maximum of 6 months before inclusion; Patient is community-dwelling; Participant or their proxy is willing and able to give informed consent for participation in this study; Participant is willing to comply with all study procedures.  Participants are sampled in the same practices as the exposed cohort and are eligible for inclusion in this study for the non-exposed without a diagnosis of COVID-19 in the last 6 months when they meet all of the following criteria:  Aged 18 years or older; Tested because of suggestive symptoms with a rapid Ag test or PCR for SARS-CoV-2 at the same time (+/- 1 month) as the exposed cohort, of which the result was negative Patient is community-dwelling; Participant or their proxy is willing and able to give informed consent for participation in this study; Participant is willing to comply with all study procedures.  Exclusion Criteria:  Participants eligible for the cohort with COVID-19 in the last 6 months must not meet any of the following criteria:  Patients in palliative care; Patients for whom there is already someone from the same household participating; Judgement of the recruiting clinician deems participant ineligible.  Participants eligible for the cohort without COVID-19 must not meet any of the following criteria:  A positive test for a SARS-CoV-2 infection in the last 2 years; Patients in palliative care; Patients for whom there is already someone from the same household participating; Judgement of the recruiting clinician deems participant ineligible.  Prior vaccination against Covid-19 is not an exclusion criterion.