[The impact of immunosuppression and chronic kidney disease on immunogenicity of COVID-19 vaccines]. / Der Einfluss von Immunsuppression und chronischen Nierenerkrankungen auf das Ansprechen auf COVID-19-Impfungen.

HOW EFFECTIVE ARE THE APPROVED VACCINES IN KIDNEY DISEASES AND THOSE RECEIVING IMMUNOSUPPRESSION?: Several observational studies indicated that immunosuppression is associated with a weakened or absent humoral response. Patients with chronic kidney diseases or undergoing maintenance dialysis without immunosuppression have a reduced humoral response to COVID-19 vaccines. I HAD COVID-19. SHOULD I GET VACCINATED?: It is recommended to receive a booster after SARS-CoV-2 infection with a mRNA vaccine. IS A COVID-19 VACCINATION DESPITE ONGOING IMMUNOSUPPRESSION POSSIBLE?: Patients receiving immunosuppression have a reduced humoral response, and this is especially observed when anti-CD20 therapy is used. IS THERE A POSSIBILITY THAT THE VACCINE PROVOKES REJECTION OF MY TRANSPLANTED KIDNEY OR RELAPSE OF MY GLOMERULAR DISEASE?: Several reports were published in the last months highlighting new-onset diseases, recurrences and relapses of different glomerular diseases, which occurred after the receipt of the first or second vaccine dose. As a clear association of vaccines and induction of autoimmunity still needs to be established, most of these diseases are treatable, and COVID-19 in patients under immunosuppression is often fatal, there is a clear net benefit of vaccination. DO I HAVE A PERMANENT PROTECTION AFTER VACCINATION?: The antibody titers and likely the cellular immune response is significantly reduced in patients with kidney diseases, and titers are reducing at a fast pace under ongoing immunosuppression. A booster dose should be considered, especially taking into consideration the evolvement of virus variants and their impact on vaccine efficacy. AFTER THE FIRST SERIES OF VACCINATION, NO OR ONLY A MARGINAL AMOUNT OF ANTIBODIES WERE DETECTABLE. ARE THERE STRATEGIES TO IMPROVE VACCINE RESPONSE?: Many countries recommend the application of a third dose for vulnerable patient cohorts, especially because of a weakened response and their risk to develop a severe disease course of COVID-19. Prospective clinical trials are ongoing to test the ideal strategy to improve vaccine response in these cohorts.

[SARS-CoV-2 vaccines - what the nephrologist should know]. / SARS-CoV-2-Impfungen ­ Was muss der Nephrologe wissen?

Only fifteen months after the beginning of the COVID-19 pandemic, several vaccines are already available for clinical use. While the spike protein of SARS-CoV-2 constitutes the main target of all predominant SARS-CoV-2 vaccines, they work by different mechanisms (mRNA-based vaccines vs. vector-based vaccines vs. protein-based vaccines).Though there are slight differences regarding the level of protection against mild COVID-19, all five vaccines that have been through phase 3 trials were nearly 100 % effective in preventing severe or fatal cases of COVID-19. The side effects were of short duration.Patients with chronic kidney disease (or other significant comorbidities) were largely excluded from Phase 3 trials, which makes definite recommendations concerning their vaccination difficult. The vaccine's effectiveness may be reduced in that population due to a uremic immune defect and/or immunosuppressive medication. However, these patients have an increased risk for severe or fatal COVID-19, so that they may particularly benefit from the vaccine.