Carpets are large electrostatic charge generators.  As the positive charge builds on the child as his skin rubs across the carpet fibers, the atmosphere will supply electrons and other negatively charged particles until the child is “neutralized”. The stronger the electric field in the atmosphere the higher the current flow to the child.  If a carpet is cleaned by mechanical action, a neutral child crawling on it will also be attacked by electrons on the carpet and also become negatively charged. Electrons will not just flow across the skin, they will take all paths to ground, including through the child depending upon resistance paths.

http://www.mayoclinic.org/diseases-conditions/kawasaki-disease/basics/symptoms/con-20024663

Symptoms:

• Fever which often is higher than 102.2 F (39 C) and lasts more than five days
• Extremely red eyes (conjunctivitis) without a thick discharge[Negative electron/ion flow from atmosphere to moist conductive eyes]
• A rash on the main part of the body (trunk) and in the genital area [Electrons will flow across skin and concentrate on conductive areas]
• Red, dry, cracked lips and an extremely red, swollen tongue (strawberry tongue) [Negative electron/ion flow from atmosphere to moist lips/tongue]
• Swollen, red skin on the palms of the hands and the soles of the feet [Electrical Discharge to/from carpet/Earth ground]
• Swollen lymph nodes in the neck and perhaps elsewhere [Lymph is conductive fluid]
• Irritability

Predictions if Kawasaki Disease is related to Static Electricity:

• Should be linked to carpets, which can generate lots of static, either when a child is crawling on them or after a cleaner/dryer/vacuum is used on them (mechanical action):

http://www.ncbi.nlm.nih.gov/pubmed/2020511

“Although the reason for this unusually large outbreak remains obscure, it is the third in which a statistically significant association between Kawasaki syndrome and rug or carpet cleaning has been found.”

http://gawker.com/5122538/the-carpet-cleaner-controversy-that-preceded-jett-travoltas-death

• Should be worse in countries (such as Japan) that do not wear shoes indoors because skin on carpet creates most of the static charge. 

https://en.wikipedia.org/wiki/Kawasaki_disease

“Regardless of where they are living, Japanese children are more likely than other children to manifest the disease, which suggests genetic susceptibility”

http://villagehiker.com/travel/travel-japan/shoe-etiquette-in-japan.html

“Everyone seems to be aware of the no-shoes-inside customs of Japan. How do you wear shoe etiquette seamlessly?”

• Martial arts practiced with bare feet on rubber pads or carpet will generate lots of static charge and should lead to more disease in those countries – Primarily Asian.

Solving the mystery of Kawasaki Disease

“Bill explained how William was excited about Tae Kwon Do before the illness, “Working out everyday. For him just to fall, to go from one extreme to the other, it’s heart breaking.””

http://www.chinapost.com.tw/taiwan/national/national-news/2016/02/15/458331/Nations-Liu.htm

“Liu said it was an unusual experience to compete in a city where the temperature was minus 20 degrees Celsius. “I did not feel right from head to toe,” with static electricity creating noise here and there, he said.”

•  Should be worse during colder months (humidity drops and static buildup increases)

http://www.esrl.noaa.gov/psd/spotlight/03152002/

“KD incidence was inversely associated with mean monthly temperature (r=-0.47, p<0.001), and positively associated with mean monthly precipitation (r=0.52, p<0.001) during the 60-month period.”

• Should begin showing up in kids ~ 6 months old as they begin crawling on carpets and creating lots of static electricity

http://www.ncbi.nlm.nih.gov/pubmed/16511387

“Kawasaki disease is the leading cause of acquired heart disease in childhood. However, there are only a few reports in infants younger than 6 months.”

http://www.parents.com/baby/development/crawling/when-do-babies-crawl/

“Babies typically begin to crawl between 6 and 10 months,”

• Should be linked with preschools with playgrounds because plastic slides and rubber turf can create lots of static and kids crawl, climb and slide a lot. Electron flow on skin could cause dermatitis.

http://www.ncbi.nlm.nih.gov/pubmed/24069052

Increased risk of atopic dermatitis in preschool children with kawasaki disease: a population-based study in taiwan. Abstract Kawasaki disease (KD) is an acute febrile systemic vasculitis and has been reported to be associated with allergic disease.

The chronic electrostatic charge/discharge could also be related to hand foot & mouth disease in children from playgrounds and carpets and other childhood diseases that include inflammation of the lymph system, arteries and the nervous system.