Summary The data collected will identify real-life risk factors for getting the COVID-19
diagnosis.

The Oslo University Hospital/University of Oslo web-based solution "nettskjema" will be
used to collect data and consent forms.

The impact of knowing the risk factors for COVID-19 is tremendous because it can enable
governments to conduct more targeted public health measurements than today to reduce the
spread of the virus.

Detailed description Research into an ongoing COVID-19 outbreak is difficult because
patients are isolated, and supplies of personal protective equipment (PPE) supplies are
limited. The risk of transmission to study personal is non-negligible even when PPE is
available.

A study design based on an electronic questionnaire and consent from delivered from the
Oslo University Hospital/University of Oslo, GDPR (General Data Protection Regulation)
compliant "TSD" service has therefore been chosen.

The study will be a case-control study based on a combined electronic consent form and
questionnaire that the participants will fill in using a smartphone and electronic
identification.

The groups that will be included are:

- Hospitalized and non-hospitalized patients/persons with COVID-19 at all stages of
the disease and after the disease

- Hospitalized patients without COVID-19

- Healthcare personal or other groups with an increased risk of COVID-19

- Healthy volunteers

Participants may be followed with repeated questionnaires prospectively.

Biological samples Biological samples may hold crucial information about the
susceptibility to COVID-19 and for susceptibility to the progression of the disease. It
is within the scope of the study to analyze such samples from a limited number of
participants which will be asked to provide such samples or hospitalized patients that
have surplus material. The material will be analyzed with non-genetic methods most
suitable to provide such information.