COVID-19 and solid organ transplantation: Finding the right balance

Area of Science:

• Immunology
• Transplant Medicine
• Infectious Diseases

Background:

• The COVID-19 pandemic significantly impacts solid organ transplant (SOT) recipients due to pre-existing conditions and immunosuppressive therapies.
• Existing research on the pandemic's multifaceted effects on SOT patients remains limited.

Purpose of the Study:

• To systematically review risk factors for severe COVID-19 and mortality in SOT recipients.
• To analyze the impact of immunosuppression, clinical outcomes, and vaccine efficacy in this vulnerable population.

Main Methods:

• A systematic literature search was conducted on PubMed, focusing on SOT recipients and COVID-19.
• Articles were selected based on topics including mortality, risk factors, immunosuppression, and immune response to infection and vaccination.
• Data from 77 selected articles were extracted, analyzed, and summarized.

Main Results:

• Advanced age was linked to mortality; comorbidities had variable impact. SOT recipients had higher acute kidney injury risk but not increased mortality.
• Immunosuppression was managed without significant graft dysfunction, and no clear link was found between immunosuppression type and mortality.
• SOT patients mounted comparable humoral and cellular immunity after COVID-19 infection but showed a reduced response to two-dose mRNA vaccines.

Conclusions:

• SOT recipients generally tolerate COVID-19 infection well immunologically but exhibit a blunted response to initial mRNA vaccination.
• Further research is essential to understand COVID-19's direct graft effects, particularly in lung transplant recipients, and factors influencing immune response in SOT patients.