Table 2. Analysis of antisera responses in geese and chickens obtained via hemagglutination inhibition (HI) assay.

Data are presented as No. of positive HI antisera responses/No. of birds (HI titers in each bird). HI titers obtained with homologous virus. ^*The days post-infection (PI), when anti-H9N2 sera from birds infected with the homologous virus were collected (e.g., anti-SH/F/98 virus sera from birds infected with SH/F/98 virus). ^†Viruses used in animal experiments.