Kawasaki disease (KD) is a self-limited illness that results in coronary artery aneurysms (CAAs) and threatens children's health and lives. The therapeutic effects of single intravenous immunoglobulin gamma (IVIG) 
The databases of the Cochrane Library, PubMed and Embase websites were searched for articles appearing from inception until December 31, 2020. Clinical studies that compared IFX either as initial therapy plus IVIG or rescue therapy after IVIG (IFX group) failure compared with IVIG treatment alone (IVIG group) in treating KD patients were included.
The meta-analysis included nine studies characterizing 712 patients. The treatment response was significantly higher in the adjunctive IFX therapy group than in the IVIG therapy group [odds ratio (OR) 2.64; 95% CI: 1.52-4.59; P=0.0005]. Subgroup analysis, the effect of IFX therapy on treatment response is more effectiveness in the group of the high-risk KD patients than IVIG therapy (OR 6.07; 95% CI: 2.30-16.04; P=0.0003; random-effects model). Further analysis showed no difference in the improvement of CAAs in short-term follow-up between the two groups. However, adding IFX either as initial therapy or as additional therapy all showed an advantageous effect regarding the ∆Z score of the left anterior descending (LAD) (MD =0.29; 95% CI: 0.27-0.31; P<0.00001) and right coronary artery (RCA) (MD =0.24; 95% CI: 0.22-0.26; P<0.00001). Further, IFX exhibited significant effect on the treatment response compared with IVIG therapy in the Asian group (OR, 2.84; 95% CI: 1.51-5.36; P=0.001; random-effects model), and the beneficial effects of IFX were given without increasing the risk of AEs.
This meta-analysis emphasizes the importance of IFX on the treatment response in the high-risk KD patients. IFX may play a role in the Asian KD patients and prevention of progressive CAA, and does not increase the risk of AEs in KD patients.