ArticleThe Pediatric infectious disease journal2026
SARS-CoV-2 Reinfection and Risk of Multisystem Inflammatory Syndrome in Children: A Case-control Study.
Article in The Pediatric infectious disease journal, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
backgroundMultisystem inflammatory syndrome in children (MIS-C) is a severe postinfectious complication of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection, primarily affecting children 6-12 years of age. Although MIS-C was prominent during the early pandemic waves, recent studies suggest a declining incidence concurrent with increasing reinfection rates. The objective was to determine whether the risk of MIS-C differs following a primary SARS-CoV-2 infection versus reinfection.
methodsA retrospective, multicenter, international, matched case-control study was conducted from September 1, 2021, to April 30, 2022. MIS-C cases were recruited from 14 French and Swiss hospitals. Eligible cases included children younger than 18 years meeting the 2020 World Health Organization case MIS-C definition with laboratory evidence of SARS-CoV-2 infection. Cases were matched 1:1 by age, sex and epidemic period to controls with laboratory-confirmed acute SARS-CoV-2 infection. Vaccinated patients and those without consent were excluded. The primary outcome compared the association of reinfection with MIS-C versus acute infection using McNemar's test to estimate matched odds ratios (ORs). Prespecified sensitivity analyses used conditional logistic regression.
resultsThe matched cohort included 180 MIS-C cases (median [IQR] age, 106 [62-136] months) and 180 controls (median [interquartile range] age, 72 [48-108] months). No MIS-C cases had a documented reinfection, whereas 3.9% (7/180) of controls did (McNemar χ 2 = 5.142; P = 0.023; matched OR, 0.067; 95% confidence interval [0.004-1.167]; P = 0.064). Sensitivity analysis also suggested a lower odds of MIS-C after reinfection without reaching statistical significance (adjusted OR, 0.183; 95% [0.027-1.234]; P = 0.093).
conclusionMIS-C occurred predominantly after first SARS-CoV-2 infections; while evidence for a lower risk following reinfection was suggestive but not conclusive.
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