Table 1.

WHO suggested dengue case classification and levels of severity.

Criteria for dengue with or without warning signs		Criteria for severe dengue
Probable dengueLive in/travel to dengue-endemic areasFever and 2 of the following criteria: nausea, vomiting; rash; aches and pains; tourniquet test positive; leukopenia; any warning sign.Laboratory-confirmed dengue(important when no sign of plasma leakage)	Warning signs*Abdominal pain or tenderness; persistent vomiting; clinical fluid accumulation; mucosal bleed; lethargy, restlessness; liver enlargement >2 cm; laboratory: increase in HCT concurrent with rapid decrease in platelet count*(requiring strict observation and medical intervention)	Severe plasma leakageShock (DSS); fluid accumulation with respiratory distress Severe bleedingAs evaluated by clinicianSevere organ involvementLiver: AST or ALT >=1000; CNS: impaired consciousness; heart and other

Reproduced with permission of WHO. Dengue haemorrhagic fever: diagnosis, treatment, prevention and control. Geneva: WHO 2009