Sazgary, L., Meienberg, A., Berger, C.T. and Mayr, M. 2021. The Meaning of SARS-CoV-2 Antibodies in a Patient with a Systemic Reaction to the mRNA-1273 SARS-CoV-2 Vaccine after Previous Natural Immunization . European Journal of Case Reports in Internal Medicine. 8, 6 (Jun. 2021). DOI:https://doi.org/10.12890/2021_002617.