The Danish Microbiological Database (MiBa) contains all microbiological test results from all clinical microbiological departments in Denmark and microbiological and serological results from TestCenter Denmark [20]. Tests are registered in MiBa in a person identifiable format, by use of the civil registration number. Using MiBa we identified antibody test results and previous SARS-CoV-2 RT-PCR-test results amongst the study participants. From the Danish surveillance system of COVID-19 [21, 22] which is built on MiBa, we used information on the number of admitted and deceased RT-PCR-confirmed SARS-CoV-2 cases by date, sex and age group as well as the number of RT-PCR SARS-CoV-2 tests carried out. The Danish surveillance system of COVID-19 involves daily registry linkage to the National Patient Registry [23] for information about hospital admissions, and to the Civil Registry for information about sex and age, and The National Cause of Death Register [24] for information about deaths within 30 days for RT-PCR-diagnosed COVID-19 cases.
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