NLRP3 and susceptibility to pneumonia measurement: As shown in Figure 1, the results showed that the levels of TNF‐α, IL‐1β, NLRP3, and LL‐37 in serum were significantly increased in the KD group compared with the healthy physical examiners group (p < .01), while the levels of TNF‐α, IL‐1β, NLRP3, and LL‐37 were enhanced in the serum of the KD group compared with the pneumonia group (p < .05), indicating the development of a significant inflammatory response in children with KD.