inclusion criteria: patient has received a kidney transplantation full sars-cov-2 vaccination with mrna vaccine (two doses) at least 4 weeks before screening > 18 years of age no sars-cov-2 spike protein antibodies at least 4 weeks after the second dose of an mrna vaccine

inclusion criteria: patient has received a kidney transplantation full sars-cov-2 vaccination with mrna vaccine (two doses) at least 4 weeks before screening > 18 years of age no sars-cov-2 spike protein antibodies at least 4 weeks after the second dose of an mrna vaccine