Inclusion Criteria:  All residents in any of 136 nursing homes in Östergötland County Council, Sweden who had a laboratory confirmed COVID-19 diagnosis and who died within 30 days after the verified COVID-19 were included in three separate periods: First period from March 31 to June 30 2020; second period from October 15 2020 to January 15 2021; third period from January 16 to April 18 2021.  Exclusion Criteria:  -