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ENGLISH ABSTRACT
JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
[Laboratory diagnosis of dengue virus infections in Aragua State, Venezuela: October 1997-December 1998].
Investigación Clínica 2003 June
The efficacy of a proactive dengue surveillance system to predict epidemics depends on the laboratory diagnostic capacity for an early detection of virus circulation. This study shows the results of the dengue virologic and serologic surveillance accomplished in Aragua State (Venezuela) from October 1997 to December 1998. Five hundred and forty seven sera from suspected dengue patients were tested using the techniques of Virus Isolation and Immunofluorescence Serotyping (VIIS), Reverse Transcriptase-Polymerase Chain Reaction (RT-PCR), Anti-dengue IgM Capture Enzyme Immunoassay (MAC-ELISA) and Haemagglutination Inhibition test (HI). Of the tested sera, 97.4% resulted positive to at least one technique; of these, 60.4% were classified as confirmed cases (virologically positives) and 39.6% as probable cases (virologically negatives/serologically positives). Though the majority of positive cases occurred during the 1997 and 1998 epidemic periods, the gradual increase of the seropositive rates between both periods suggested the incoming 1998 outbreak. Den-1 (51.2%), Den-2 (37.9%) and Den-4 (10.6%) infected patients were detected as well as one dual infection of Den-2 and Den-4 (0.3%). Dengue hyperendemicity (co-circulation of Den-1, Den-2 and Den-4) in Aragua State was confirmed together with the detection of few cases (6.5%) of Dengue Hemorrhagic Fever/Dengue Shock Syndrome cases (HF/DSS); 38.1% of these cases occurred in patients with secondary infections. The high percentage (85.7%) of DHF/DSS cases infected by Den-2 virus supports the reported virulence of this serotype.
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