Use of simple clinical and laboratory predictors to differentiate influenza from dengue and other febrile illnesses in the emergency room

Table 3 Complications of influenza and dengue infections

Complication ^a	Influenza (n = 526)	Dengue (n = 148)	P
Pneumonia	27^b (5.1)	1 (0.6)	0.016
ARDS	5^c (0.9)	0	0.234
Meningoencephalitis	6^d (1.1)	0	0.192
Intracranial bleeding	2^d (0.4)	0	0.452
Gastrointestinal bleeding	2^d (0.4)	14 (9.5)	<0.001
Myocarditis	1^d (0.2)	0	0.596
Acute hepatitis (ALT >1,000 U/L)	2^d (0.4)	0	0.452

Data are number (%) of patients. ARDS = acute respiratory distress syndrome; ALT = alanine aminotransferase.
^aAn individual patient might have more than one complication.
^bOf 27 influenza patients with pneumonia, 15 cases were 2009 pandemic H1N1 and 12 cases were H3N2.
^cOf 5 influenza patients with ARDS, 4 cases were 2009 pandemic H1N1 and 1 case was H3N2.
^dPatient(s) with 2009 pandemic H1N1 infection.

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