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Performance of IgG and IgM ELISAs using a West Nile virus antigen evaluated.
2004 DEC 29 - (NewsRx.com & NewsRx.net) -- Scientists report the performance of IgG and IgM enzyme-linked immunosorbent assays using a West Nile virus recombinant antigen for detection of West Nile virus- and other flavivirus-specific antibodies.
According to a study from the United States, "Focus Technologies developed an indirect immunoglobulin G (IgG) enzyme-linked immunosorbent assay (ELISA) and a mu-capture IgM ELISA for the detection of West Nile virus (WNV)-specific antibodies based on a WNV preM/E protein recombinant antigen. Normal and disease state serum panels were used to assess the performance characteristics of the two WNV ELISA kits. Totals of 807 and 1,423 sera were used to assess the IgG ELISA and IgM ELISA kits, respectively."
"The Focus Technologies IgG ELISA had a sensitivity of 97.6% and a specificity of 92.1% (excluding non-WNV flavivirus sera)," said Wayne R. Hogrefe and colleagues at Focus Technology. "The comparative method for WNV IgG may lack sensitivity in detecting IgG in early WNV infection, so the specificity of the Focus IgG ELISA may be higher than 92.1%. When sera from patients either infected with or vaccinated against other flaviviruses were tested on the WNV IgG assay, 35% of the sera reacted as positive for WNV IgG. Yellow fever and Japanese encephalitis vaccinees were less reactive in the IgG ELISA than St. Louis and dengue fever patients."
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