Or which agent in the carpet cleaner that the kids could have been exposed to.
https://www.kpbs.org/news/2019/apr/22/kawasaki-disease-spike-related-aerosol-particles-s/
Throwing people off the scent.
Coincidence that there's a flareup of cases in San Diego where some of the main research centers for studying the disease are located?
https://arstechnica.com/science/2015/06/the-mystery-of-kawasaki-disease/
https://www.newsweek.com/kawasaki-disease-san-diego-children-heart-disease-1332767
https://www.rchsd.org/programs-services/kawasaki-disease-clinic/
https://medschool.ucsd.edu/som/pediatrics/research/centers/kawasaki-disease/Pages/default.aspx