Table 4. Comparison between the WHO 1997 dengue classification and WHO 2009 dengue classification for laboratory-confirmed dengue patients admitted to ICUs in Minas Gerais, Brazil.

	DF	DHF I & II	DHF III & IV	Total
	n (%)	n (%)	n (%)	n (%)
Dengue with warning signs	16 (16.5)	14 (14.4)	-	30 (30.9)
Severe dengue	34 (35.1)	13 (13.4)	20 (20.6)	67 (69.1)
Total	50 (51.6)	27 (27.8)	20 (20.6)	97 (100)

DF: dengue fever; DHF I & II: dengue hemorrhagic fever grade I and II; DHF III & IV: dengue hemorrhagic fever grade III and IV.