Which age groups have the highest incidence of Kawasaki disease?

Updated: Jul 29, 2018
  • Author: Tina K Sosa, MD; Chief Editor: Russell W Steele, MD  more...
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Approximately 85-90% of KD cases occur in children younger than 5 years [22] ; 90-95% of cases occur in children younger than 10 years. In the United States, the incidence peaks in children aged 18-24 months. In Japan, the incidence peaks in children aged 6-12 months.

KD has rarely been reported in adolescents and adults, most of whom are between ages 18 and 30 years. [44] Fewer than 60 adult patients have been described in the literature for various geographic locations, including 25 in Europe, 23 in North America, 5 in Asia, 2 in South America, and 2 in Africa. [46]  Kawasaki-like syndromes have been reported in adults infected with human immunodeficiency virus (HIV). However, it is unclear whether this is a variant of KD or an unrelated entity in the immunocompromised population. [47]

Children younger than 6 months and those older than 9 years are more likely to have an incomplete presentation, and are also more likely to have a suboptimal outcome. [48]

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