Objective To detect the seroepidemiologic antibody to the subtypes of avian influenza A virus,H5 and H9 in poultry breeding workers,to understand the infection of avian influenza A virus.Methods For detecting antibody to these two subtypes with HI test,277 serum specimens were collected from poultry breeding workers,and 270 were from normal Entry-Exit passengers in Zhuhai port.Results In poultry breeding workers,the positive rate to H9 was 2 17%,and 1 serum specimens had antibody to H5,The positive rate...

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