Hemagglutinin-inhibition test is used in this study to monitor the 178 serum samples from healthy and unimmuned swine,duck,goose and chicken in Heilongjiang province on May in 2005.Furthermore,the data are analyzed statistically.The results of samples from Suihua showed that the sample numbers of the positive of antibody anti-H9 subtype IV are 24,the positive rate is 53.3 %(of 45 samples);the result of samples from Hailin showed that the samples numbers of the positive of antibody anti-H9 subtype IV are 29 ...

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