This systematic review looked at studies on children with SARS-CoV-2 infection to see how vaccination affected their risk of developing multisystem inflammatory syndrome, or MIS-C. The review included six studies and focused on children who received one or two doses of a SARS-CoV-2 vaccine compared to those who were unvaccinated or partially vaccinated.
The main finding was that two vaccine doses showed a significant protective effect against MIS-C after infection. A single dose showed a trend toward protection, but it was not statistically significant. The review did not report specific numbers of children affected or detailed safety data.
The evidence is based on observational studies, so it shows a link but cannot prove the vaccine causes the lower risk. The certainty of the evidence is limited because only a few studies were included and some potential bias was noted.
The main reason to be careful is that this is a review of a small number of studies, and the results may not apply to all children. Readers should understand that this supports vaccination but does not provide new safety data or change current medical advice.