Detection of serum antibody to Japanese encephalitis by enzyme-linked immunosorbent assay.

An enzyme-linked immunosorbent assay (ELISA) for the detection of Japanese encephalitis (JE) antibody is described, after 269 human sera were tested by both hemagglutination inhibition (HI) test and ELISA. In ELISA screening, the antigen concentration and the dilution of horseradish peroxidase conjugated goat anti-human Ig were determined by chequerboard titration as 10 micrograms/ml and 1:1000. The color produced by enzyme-substrate reaction was measured on a spectrophotometer. The results showed a good agreement with those obtained from a routine HI test.