Table 1.

Dengue virus isolation rate of positive dengue nested polymerase chain reaction (PCR) samples

Category	No. tested	No. positive	Isolation rate (%)	DHF*	DF*
C6/36 isolation (All positive PCR)	1544	966	62.5%	553	351
Mosquito isolation (C6/36 negative)	578	260	45.0%	178	67
Total isolation rate	1544	1226	79.4%

^*A diagnosis of dengue fever (DF) and dengue hemorrhagic fever (DHF) was determined based on World Health Organization criteria. Not all patients received a final diagnosis because of incomplete laboratory results or non-compliance with physician's orders to return for evaluation during the recovery phase.