To establish more specific and simple diagnostic methods for detection of the antibodies and antigens of Aujeszky´s disease virus(ADV), we designed indirect dot-immunoassay(IDI) and double sandwich dotimmunoassay(DSDI) using the solid phases of nitrocellolose paper and polystyrene plate. The diagnostic efficacy of these methods was investigated.
As the sensitivity of IDI was tested by various virus concentration, the specimens with the virus titer above 10^4.0 TCID_(50)/0.2㎖ showed positive reaction, but that below 10^1.0 TCID_(50)/0.2㎖. revealed negative. Tonsil emulsion at the virus titer of 10^4.5 TCID_(50)/0.2㎖ showed the highest sensitivity as diluted by 1/100. In detection of ADV antigens from the various tissues of the rats and pigs infected with ADV, IDI using monoclonal antibody showed the higher specificity as compared with IDI using polyclonal antibody and virus isolation method.
The efficacy of the DSDI for detection of ADV antibody was compared with other tests. The sensitivity of DSDI was higher than virus neutralization(VN) and agar gel immunodiffusion test(AGID). Meanwhile, specificity of DSDI was lower than AGID, but similar to IDEA. In comparison with VN test, DSDI showed 96.9% agreement to VN test that is the highest of three tests. In general, application of polyclonal antibody in both tests caused the higher sensitivity but the lower specificty.
|