Kawasaki disease, also known as mucocutaneous lymph node syndrome, is a disease of unknown etiology. Epidemiological data suggest that multiple pathogens such as Rickettsia, Staphylococcus, Streptococcus, retroviruses, and Mycoplasma infections may be the causes, but these have not been confirmed. The incidence of this disease is relatively low worldwide, though it occurs more frequently among Asians. Epidemiological surveys in China from 2002 to 2004 indicated that the incidence rate among children under five in Beijing was 49.4/100,000. Although not particularly high, this incidence rate still makes it a relatively common autoimmune disease. The primary treatments for this disease are intravenous immunoglobulin and aspirin.