{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,19]],"date-time":"2026-05-19T14:12:54Z","timestamp":1779199974165,"version":"3.51.4"},"reference-count":167,"publisher":"MDPI AG","issue":"5","license":[{"start":{"date-parts":[[2026,5,14]],"date-time":"2026-05-14T00:00:00Z","timestamp":1778716800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["CIMB"],"abstract":"<jats:p>Background\/Objectives: Kawasaki\u2019s disease (KD) is a leading cause of heart disease in children. The multisystem inflammatory syndrome (MIS) associated with the SARS-CoV-2 virus is similar to KD. The etiologies of KD and MIS are unknown. Both diseases are associated with pathogens and immunizations. Methods: The Vaccine Adverse Event Reporting System (VAERS) was retrospectively examined for etiology insights into both KD and MIS. Results: Statistically significant, elevated AE MIS safety signals were observed for several COVID-19 Pfizer-BioNTech manufacturing lots. Elevated AE MIS normalized frequencies were observed in children of all ages. Immediate-onset AE KD safety signals were detected for specific vaccines and coadministered combinations of these vaccines (including specific live, attenuated virus vaccines and other specific vaccines) for young infants; a subset of these safety signals has a male sex bias, whereas others appear to be unbiased. Conclusions: Both KD and MIS are hypothesized to involve two activation pathways. The first pathway is hypothesized to involve high titers of immune complexes that activate Fc receptors on mast cells, platelets, and other immune cells. Immune complex titers higher than primary immune response levels are hypothesized to be required to activate low-affinity IgGFc\u03b3R2\u03b1 receptors on immune cells and platelets. IVIG treatment is hypothesized to directly compete with immune complex binding to Fc\u03b3R2\u03b1 receptors. The second hypothesized pathway is proposed to directly activate mast cells and other immune cells without involving immune complexes and Fc receptors; lack of Fc receptor competition by immune complexes is hypothesized as a possible explanation for IVIG nonresponders for KD and MIS, worthy of future studies. The proposed etiology models for both KD and MIS may be consistent with being novel mast cell activation syndromes (MCAS). MIS is hypothesized to be KD-associated with the SARS-CoV-2 virus or the COVID-19 spike protein (MIS-V).<\/jats:p>","DOI":"10.3390\/cimb48050508","type":"journal-article","created":{"date-parts":[[2026,5,19]],"date-time":"2026-05-19T13:11:31Z","timestamp":1779196291000},"page":"508","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Etiology Model of Kawasaki Disease and Multisystem Inflammatory Syndromes: Mast Cell Activation"],"prefix":"10.3390","volume":"48","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2842-2809","authenticated-orcid":false,"given":"Darrell O.","family":"Ricke","sequence":"first","affiliation":[{"name":"Molecular BioInsights, 37 Pilgrim Drive, Winchester, MA 01890, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2026,5,14]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"e927","DOI":"10.1161\/CIR.0000000000000484","article-title":"Diagnosis, Treatment, and Long-Term Management of Kawasaki Disease: A Scientific Statement for Health Professionals from the American Heart Association","volume":"135","author":"McCrindle","year":"2017","journal-title":"Circulation"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"75","DOI":"10.1007\/s11926-020-00941-4","article-title":"Kawasaki Disease: An Update","volume":"22","author":"Rife","year":"2020","journal-title":"Curr. 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