Background:SARS-CoV-2 (Severe acute respiratory syndrome coronavirus type 2) has had us firmly inits grip for more than two years. In January 2021, the quality and risk management unitof the LKH (Landeskrankenhaus) -Univ. Klinikum Graz commissioned to carry outvaccinations for employees and subsequently for high-risk patients.In the vaccination line, which was open for 85 days in 2021/22, the vaccines from AstraZeneca, Biontech-Pfizer and Moderna were vaccinated. There were hardly any complications.The primary immunization, booster vaccination and booster vaccination were carried out.Despite the small number of incidents in the sense of an immediate reaction, there werenumerous sick leave.Methods:For this reason, in the course of the booster vaccination, starting from October 2021 toJanuary 2022, every vaccinated person was asked to fill out a questionnaire.Participation was voluntary and was supported by the works councils of the MedicalUniversity and the LKH-University clinic Graz approved. The survey served toretrospectively record how many employees developed symptoms in response to therespective vaccination.With this approach it will be possible to subject the responses to an in-depthstatistical analysis in order to obtain a data-based contribution to the side effects ofvaccines categorized with different vaccination schemes.