Potential impact of viral skin diseases and other viral infections on the incidence and severity of COVID-19 in renal transplant patients

Background: COVID-19 in solid organ transplant recipients is usually characterized by more severe disease course and is often associated with life-threatening complications. Identification of additional factors that may affect the risk and severity of the new coronavirus infection could have a significant impact on choosing a management strategy for renal graft recipients. Aim: To evaluate the possibility of cross-immunity between skin manifestations of viral etiology and COVID-19. Materials and methods: From May 2020 to February 2021 we examined 180 renal graft recipients with a history of transplantation from 2 months to 26.5 years. All patients were categorized into two groups: groupI (n=68), those who had confirmed moderate or severe COVID-19 disease and groupII (n=112), those without any history of clinical manifestations of the new coronavirus infection (including those with potentially asymptomatic disease). During the study period which lasted for 71 months on average (range, 2 to 318 months), laboratory workupwas performed in all patients (on average, twice): dermatological examination and detection of serum antibodies to herpes simplex virus 1, 2, cytomegalovirus, human papilloma virus (HPV), Epstein-Barr virus, SARS-CoV-2. Results: In recipients with HPV-associated skin manifestations, the incidence of COVID-19 was significantly lower than in recipients who did not have them 30.4% (34/112) and 50% (34/68), respectively (p=0.011). The incidence of new coronavirus infection did not differ in the groups of patients with cutaneous manifestations caused by herpes simplex viruses type 1 and 2, and without them. Among recipients with Epstein-Barr virus seropositivity, there were significantly fewer cases of COVID-19 compared to seronegative patients 26.2% (28/107) and 54.8% (40/73), respectively (p=0.0002). Conclusion: HPV-associated dermal manifestations or serum Epstein-Barr virus-seropositivity in renal graft recipients is associated with lower incidence of moderate and severe COVID-19. Further studies are needed to confirm the possibility of cross-immunity against SARS-CoV-2 with other infections.