title: Enzyme immunoassay for the detection of dengue IgG and IgM antibodies using infected mosquito cells as antigen.
abstract: The detection of immunoglobulin (Ig)G and IgM antibodies to dengue 1 virus was studied by a simple enzyme immunoassay, in which infected cultured cells infected with dengue virus were used as antigen (EIA-ICC). Detection of anti-dengue 1 IgG by EIA-ICC was correlated with haemagglutination assays. EIA-ICC anti-dengue 1 IgM detection was less sensitive than IgM capture enzyme-linked immunosorbent assay. IgG and IgM responses in dengue 1 infection were studied by EIA-ICC, using sera collected at different intervals after onset of illness: IgM and IgG appeared on the 4th day of disease; the highest IgM mean titres were detected on the 7th day and IgM was not detected in sera obtained after the 60th day; the highest mean titres of anti-dengue 1 IgG were seen in sera obtained between 22 and 30 d after onset of illness. EIA-ICCs for 6 flaviviruses and 1 alphavirus were conducted with sera from patients infected with dengue 1, and primary and secondary infections of other flaviviruses. The results showed that anti-dengue 1 IgG detection was sensitive, and the antibodies were cross-reactive among the flaviviruses. Anti-dengue 1 IgM detected in dengue 1 patients was mostly type specific. The pattern of secondary dengue infection, i.e. the presence of IgG and a low titre or absence of IgM antibodies, was observed in the sera of 6 patients obtained in the first week after onset of illness. EIA-ICC is useful for dengue diagnosis, surveillance and sero-epidemiological studies.
authors.affiliation: Virology Department, Oswaldo Cruz Foundation, Rio de Faneiro, Brazil.
authors.forename: L T
authors.initials: LT
authors.lastname: Figueiredo
authors.forename: M C
authors.initials: MC
authors.lastname: Simões
authors.forename: S M
authors.initials: SM
authors.lastname: Cavalcante
mesh_terms: D000293:Adolescent; D000328:Adult; D000818:Animals; D000914:Antibodies, Viral / Q000032:analysis*; D000956:Antigens, Viral / Q000276:immunology; D002460:Cell Line; D003429:Cross Reactions; D009033:Culicidae; D003715:Dengue / Q000175:diagnosis*; D003716:Dengue Virus / Q000276:immunology*; D004797:Enzyme-Linked Immunosorbent Assay; D005260:Female; D005416:Flavivirus / Q000276:immunology; D006385:Hemagglutination Inhibition Tests; D006801:Humans; D007124:Immunoenzyme Techniques; D007074:Immunoglobulin G / Q000032:analysis*; D007075:Immunoglobulin M / Q000032:analysis*; D008297:Male; D008875:Middle Aged; D011237:Predictive Value of Tests
chemical_list: D000914:Antibodies, Viral; D000956:Antigens, Viral; D007074:Immunoglobulin G; D007075:Immunoglobulin M