We found that five single nucleotide polymorphisms were more commonly found in Polish children with Kawasaki disease than in adults: rs12037447 (non-coding region), rs146732504 (KIF25), rs151078858 (PTRPJ), rs55723436 (SPECC1L), rs6094136 (RNP2). This evidence concerns the gene SPECC1L and Kawasaki disease.