There were 3 affected siblings and 1 cousin. The first child was diagnosed as having KS in 1993 at the age of 4 years. She developed fever, erythema of the oropharynx, strawberry tongue, fissured lips, red eyes, lymphadenopathy, and increased irritability. She was treated with IVIG and had no complications. All of her echocardiographic results were normal. She experienced peeling of the fingers and toes during the convalescent phase. The second sibling, her older brother, developed only fever, lethargy, and conjunctival injection at the age of 9 years in 1996. The fever lasted for 3 weeks, and he was thought to have had a viral illness. One year later, this child collapsed, was rushed to the hospital, and was diagnosed as having coronary artery aneurysms by an echocardiogram. He died shortly thereafter. The autopsy report stated that he died of coronary artery thrombosis secondary to undiagnosed and untreated KS. After the death of the second child affected with KS, the family relocated. In 2000, the third sibling, aged 7 years, developed fever, conjunctival injection, and an elevated erythrocyte sedimentation rate. An echocardiogram revealed 2 coronary artery aneurysms. In 2002, a maternal first cousin was diagnosed as having KS. She developed fever, conjunctival injection, rash, erythema of the oropharynx, and swelling of the hands. She was diagnosed as having KS on day 5 of her illness and treated with IVIG. She experienced desquamation during the convalescent phase. Her echocardiographic results were normal.