Analysis of wind dynamics and fluctuations of Kawasaki disease numbers in the different cities within the Greater Tokyo, as well as results from computer simulations with a Lagrangian particle dispersion model suggest that there is a short incubation time for Kawasaki disease, typically in the range of 6 hours to 2.5 days.
Simulations and analyses were performed from epidemiological records in towns in Japan spanning the whole archipelago, from Sapporo in Hokkaido, to Tokyo and Nagoya in the south and from every single day showing an abnormally high presence of admitted patients in hospitals. Both days within and out of major epidemics were tested, yielding similar results and indicating that the peak in Kawasaki disease cases is rapidly attained after the arrival of the wind during the winter season.
Article PNAS-USA Number #14-00380: “Tropospheric winds from northeastern China carry the etiologic agent of Kawasaki disease from its source to Japan,” by Xavier Rodó et al.(http://www.pnas.org/content/111/22/7952.full.pdf+html).