Additional heterologous versus homologous booster vaccination in immunosuppressed patients without SARS-CoV-2 antibody seroconversion after primary mRNA vaccination: a randomised controlled trial

Michael Bonelli, Daniel Mrak, Selma Tobudic, Daniela Sieghart, Maximilian Koblischke, Péter Mandl, Barbara Kornek, Elisabeth Simader, Helga Radner, Thomas Perkmann, Helmuth Haslacher, Margareta Mayer, Philipp Hofer, Kurt Redlich, Emma Husar-Memmer, Ruth Fritsch‐Stork, Renate Thalhammer, Karin Stiasny, Stefan Winkler, Josef S Smolen, Judith H. Aberle, Markus Zeitlinger, Leonhard X. Heinz, Daniel Aletaha