Kawasaki disease is an illness that affects young children. It is a form of vasculitis or inflammation of the blood vessels that happens when the immune system attacks them by mistake. Doctors do not know what causes Kawasaki disease, though they believe genetic and environmental factors may play a role. Kawasaki disease is a serious illness, but a complete recovery is possible with timely and effective treatment.

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1. Fever

The first and most common symptom of Kawasaki disease is a sudden high fever of between 100.4 and 104F. This fever does not respond to medication or antibiotics and results from the body attacking the blood vessels. It lasts for at least five days but can go on for much longer without proper treatment.

High fever thermometer Sasha_Suzi / Getty Images
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