Immune Response to Vaccination Against Covid-19, a Follow up Study

The main objective is to investigate if the antibody development to SARS-CoV-2 S protein differ after vaccination in those who have had a previous SARS-CoV-2 infection compared to Covid-19 naive individuals. The secondary objective is to improve the understanding of the cellular and serological immune response after vaccination against COVID-19 in these groups. Individuals with and without pre-existing immunity to COVID-19 are included in the study. They are included after informed consent at sites where they receive vaccines against COVID-19 within the national and regional vaccine campaign. The study includes all approved COVID-19 vaccines with marketing authorization in Sweden. Persons are enrolled after the first or second dose of vaccination and followed 4 years after vaccination. Blood is collected at inclusion and 3 months, 6 months, 1 year, 2 years, 3 years and 4 years after vaccination to assess the immune response. Data on sex, age, body mass index, medical history and concomitant medication is collected. The study is a follow-up study after vaccination and approved by the Swedish Medical Products Agency (EudraCT 2021-000683-30). Regular monitoring of the study is performed by the Clinical Trial unit at Umeå University Hospital.