SARS-CoV-2 parental vaccination and risk of multisystem inflammatory syndrome in children: a single-center retrospective study.

Purpose: Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) usually causes a mild disease in children and the most serious consequence is multisystem inflammatory syndrome in children (MIS-C). Currently, there are no data about the protective role of vaccination performed by parents on children regarding the development of MIS-C. The aim of our study is to establish whether parental vaccination is related to MIS-C and the protective value of SARS-CoV-2 vaccination performed by parents against the occurrence of MIS-C in their children.

Materials and methods: Our retrospective single center study included 124 patients aged 1 month to 18 years admitted to emergency department from April 2020 to March 2022 for coronavirus disease 2019 disease.

Results: Parental vaccination was negatively correlated with the development of MIS-C: 4% of patients with both parents vaccinated developed MIS-C, while patients with no parent vaccinated to have developed MIS-C were 20%.

Conclusion: Parental vaccination could be an important factor influencing the course of the disease and reduces the probability that a child would develop MIS-C by 83% if both parents vaccinated.