Table 1.

WHO grading of severity of dengue haemorrhagic fever.

Grade	Description
Grade I	Fever accompanied by non-specific constitutional symptoms; the only haemorrhagic manifestation is a positive tourniquet test, easy bruising, or both
Grade II	Spontaneous bleeding in addition to the manifestations of Grade I, usually in the form of skin and 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

Reproduced with permission of WHO. Dengue haemorrhagic fever: diagnosis, treatment, prevention and control. Geneva: WHO 1997