Use of ELISA procedures for the detection of Derzsy's disease virus of geese and of antibodies produced against it.

We have developed a double antibody sandwich (antigen capture) ELISA for the detection of Derzsy's disease virus (GPV-1) antigen produced in cell cultures. This provided unambiguous quantification of virus whereas evaluation of cytopathic effect was sometimes difficult. A blocking ELISA was developed to quantify anti-GPV-1 antibodies in goose sera. This method was rapid, simple, easily standardized and correlated well with a virus neutralization test.

Sandwich enzyme-linked immunosorbent assay (ELISA) for measuring the concentration of, and detection of antibodies to, Aujeszky's disease virus.

A double antibody sandwich enzyme-linked immunosorbent assay (ELISA) was developed for measuring Aujeszky's disease virus (ADV) antigen concentration and an inhibition technique based on the former was developed for detection of antibodies to ADV. The results were checked by determining the cytopathic and serum neutralization titres. The correlation was satisfactory in both cases, with correlation coefficients above 0.8. When measuring ADV antigen concentration, the lower limit of detection was 10(3) TCID 50/0.2 ml. The sensitivity of ELISA in detecting antibodies to ADV was found to be superior to that of the serum neutralization test and, thus, enabled the testing of rabbit and guinea-pig sera.