Table 2.

World Health Organization grading severity of DHF^*

Grade I	Fever accompanied by nonspecific constitutional symptoms; the only haemorrhagic manifestation is a positive tourniquet test and/or easy bruising
Grade II	Spontaneous bleeding in addition to the manifestations of grade I patients, usually in the forms of skin or other haemorrhages
Grade III	Circulatory failure manifested by a rapid, weak pulse and narrowing of pulse pressure or hypotension, with the presence of cold, clammy skin and restlessness
Grade IV	Profound shock with undetectable blood pressure or pulse

^*From World Health Organization (1997).