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The most infected species of H5N1 highly pathogenic avian influenza(HPAI) broke out in Qinghai Lake in 2005 was bar-headed goose ( Anserindicus ). To investigate the immune status to H5N1-AIV of bar-headedgeese in Qinghai Lake National Nature Reserve, 68 ejected eggs and 125in-nest eggs of the breeding colony were collected in spring 2008, andhaemagglutination inhibition (HI) was applied to analyze their yolk MAb(IgY) to H5N1-AIV. The results revealed, three years after the outbreakof HPAI in 2005, 26.5% to 35.2% of breeding pairs of the bar-headedgeese breeding on Bird Island in Qinghai Lake may have acquiredanti-H5N1 AIV immunocompetence. In addition, we analyzed therelationship of MAb titers of the nest-eggs and the nest density, andfound the significant correlation between them (r=0.736, P=0.000). Itis likely to be more adaptive that the MAb transmission pattern in thebreeding colony with high breeding density.

Immune Status to H5N1 Avian Influenza Virus of Bar-headed Geese on Bird Island in Qinghai Lake