Table 1.

Serological study of poultry at ports of entry to Hong Kong SAR for HI antibodies to the H9 subtype

Species tested% of poultry consignments positive for HI antibodies toa:
Qa/HK/G1/97Ck/HK/G9/97
Chicken58.7 (983)68.7 (908)
Chukka88.9 (9)66.7 (6)
Quail57.9 (19)54.5 (11)
Pheasant50.0 (9)40.0 (5)
Silkie chicken35.4 (48)41.7 (24)
Guinea fowl33.3 (9)0 (6)
Pigeon22.9 (35)31.6 (19)
Duck14.9 (134)37.5 (136)
Goose0 (125)38.2 (89)
  • a A consignment was considered positive if two or more birds had an HI titer of 1/32 or greater; the range was from 1/32 to 1/640. Figures in parentheses give the number of consignments tested; 13 sera from each consignment (ca. 1,000 birds per consignment) were tested in HI tests over the period from April 1999 to March 2000. On average, up to 50% of sera in the consignment were positive.