Inclusion Criteria:  Study participant who agreed to be included in the study "Studies of ongoing and completed SARS-CoV-2 infection (which causes COVID-19) within the healthcare in Stockholm County". Study participant who has received or will receive vaccine against Covid-19 and who gives new written consent to the study "Studies of ongoing and completed SARS-CoV-2 infection (which causes COVID-19) within the healthcare in Stockholm County, with regard to vaccinations".  Exclusion Criteria:  those who have not given informed consent to participate in the study In this study, no initiative is taken for vaccination. The vaccinations are carried out by the healthcare system and of course follow the established exclusion and inclusion criteria for the approved vaccines. All persons who have received the vaccine and who give written consent are eligible to be included in the study.