title: Evaluation of a commercial dengue NS1 antigen-capture ELISA for laboratory diagnosis of acute dengue virus infection.
abstract: A commercial dengue NS1 antigen-capture ELISA was evaluated to demonstrate its potential application for early laboratory diagnosis of acute dengue virus infection. Dengue virus NS1 antigen was detected in 199 of 213 acute serum samples from patients with laboratory confirmation of acute dengue virus infection but none of the 354 healthy blood donors' serum specimens. The dengue NS1 antigen-capture ELISA gave an overall sensitivity of 93.4% (199/213) and a specificity of 100% (354/354). The sensitivity was significantly higher in acute primary dengue (97.3%) than in acute secondary dengue (70.0%). The positive predictive value of the dengue NS1 antigen-capture ELISA was 100% and negative predictive value was 97.3%. Comparatively, virus isolation gave an overall positive isolation rate of 68.1% with a positive isolation rate of 73.9 and 31.0% for acute primary dengue and acute secondary dengue, respectively. Molecular detection of dengue RNA by RT-PCR gave an overall positive detection rate of 66.7% with a detection rate of 65.2 and 75.9% for acute primary dengue and acute secondary dengue, respectively. The results indicate that the commercial dengue NS1 antigen-capture ELISA may be superior to virus isolation and RT-PCR for the laboratory diagnosis of acute dengue infection based on a single serum sample.
authors.affiliation: Makmal Kesihatan Awam Kebangsaan (National Public Health Laboratory), Kementerian Kesihatan, Lot 1853 Kg. Melayu, 47000 Sungai Buloh, Selangor, Malaysia.
authors.forename: V
authors.initials: V
authors.lastname: Kumarasamy
authors.forename: A H Abdul
authors.initials: AH
authors.lastname: Wahab
authors.forename: S K
authors.initials: SK
authors.lastname: Chua
authors.forename: Z
authors.initials: Z
authors.lastname: Hassan
authors.forename: Y K
authors.initials: YK
authors.lastname: Chem
authors.forename: M
authors.initials: M
authors.lastname: Mohamad
authors.forename: K B
authors.initials: KB
authors.lastname: Chua
mesh_terms: D000208:Acute Disease; D000956:Antigens, Viral / Q000097:blood*; D003715:Dengue / Q000097:blood* / Q000175:diagnosis / Q000276:immunology; D003716:Dengue Virus / Q000276:immunology*; D004797:Enzyme-Linked Immunosorbent Assay / Q000379:methods*; D005069:Evaluation Studies as Topic; D006801:Humans; D011933:Reagent Kits, Diagnostic; D020133:Reverse Transcriptase Polymerase Chain Reaction; D012680:Sensitivity and Specificity; D017361:Viral Nonstructural Proteins / Q000097:blood*
chemical_list: D000956:Antigens, Viral; C082515:NS1 protein, dengue-1 virus; D011933:Reagent Kits, Diagnostic; D017361:Viral Nonstructural Proteins