> sounds like not that rare. Or is it rare just because doctor couldn't diagnose it? The highest incidence of Kawasaki Disease is in Japan, at 0.175% (175 case

> sounds like not that rare. Or is it rare just because doctor couldn't diagnose it? The highest incidence of Kawasaki Disease is in Japan, at 0.175% (175 cases per 100,000 children younger than five). In the UK, it's around 0.008%, though may be on the rise. In the USA, it's between 0.009% and 0.019%, according to the CDC. That's certainly fairly rare, and it doesn't surprise me that it wasn't the first thing the doctor thought - if you read the article to the end, you'll notice that he said that "[he] was actually just thinking it could be Kawasaki disease," after she called him from the hospital. As another person mentioned, he was maybe a a few hours behind the social network in his diagnosis.