40 blind samples were examined by AGARgelprecipitation (AGP), hemagglutination inhibitory (hi) test and reverse transcription-polymerase chain reaction (RT-PCR).
The results indicated that the positive rate of RPHA reached 87.5%(7/8), as compared with the positive rate of 50%(4/8) in agargelprecipitation(AGP), RPHA was more sensitive than AGP.