JAMA Network
About the Study: In this nationwide cohort study of KD in Japan, KD incidence rebounded after the relaxation of COVID-19 pandemic-related restrictions, with age-dependent patterns. Nonpharmaceutical interventions (eg, mask-wearing) during the pandemic may explain the greater rebound pattern observed in older children; however, the minimal changes in infants suggest different exposure pathways to potential KD triggers. These findings support an age-stratified approach to KD pathogenesis research, distinguishing infants from older children.
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