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Background and objectives  Antibody response after severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) vaccination is impaired in kidney transplant recipients. Emerging variants, such as B.1.617.2 ( δ ), are of particular concern because of their higher transmissibility and partial immune escape. Little is known about protection against these variants in immunocompromised patients.    Design, setting, participants, &amp; measurements  In this prospective two-center study, antispike 1 IgG and surrogate neutralizing antibodies were measured in 173 kidney transplant recipients and 166 healthy controls with different vaccination schedules. In addition, different SARS-CoV-2 epitope antibodies from 135 vaccinated kidney transplant recipients were compared with antibodies in 25 matched healthy controls after second vaccination. In 36 kidney transplant recipients with seroconversion, neutralization against B.1.1.7 ( α ), B.1.351 ( β ), and B.1.617.2 ( δ ) was determined on VeroE6 cells and compared with neutralization in 25 healthy controls.    Results  Kidney transplant recipients had significantly lower seroconversion rates compared with healthy controls. After the second vaccination, antispike 1, antireceptor-binding domain, and surrogate neutralizing antibodies were detectable in 30%, 27%, and 24% of kidney transplant recipients, respectively. This compares with 100%, 96%, and 100% in healthy controls, respectively ( P &lt;0.001). Neutralization against B.1.1.7 was detectable in all kidney transplant recipients with seroconversion, with a median serum dilution that reduces infection of cells by 50% of 80 (interquartile range, 80–320). In contrast, only 23 of 36 (64%) and 24 of 36 (67%) kidney transplant recipients showed neutralization against B.1.351 and B.1.617.2, respectively, with median serum dilutions that reduce infection of cells by 50% of 20 (interquartile range, 0–40) and 20 (interquartile range, 0–40), respectively. Neutralization against different variants was significantly higher in healthy controls ( P &lt;0.001), with all patients showing neutralization against all tested variants.    Conclusions  Seroconverted kidney transplant recipients show impaired neutralization against emerging variants of concern after standard two-dose vaccination.    Clinical Trial registry name and registration number:  Observational study to assess the SARS-CoV-2 specific immune response in kidney transplant recipients (COVID-19 related immune response),  DRKS00024668

Neutralization of SARS-CoV-2 Variants of Concern in Kidney Transplant Recipients after Standard COVID-19 Vaccination