Changing Patterns of H6 Influenza Viruses in Hong Kong Poultry Markets

Table 2

Antigenic analysis of H6 influenza viruses by hemagglutinin inhibition.

	Titera for
Virus	Hyperimmune rabbit antisera against		Postinfection chicken antisera against
	Ty/MA/1/65	Sh/Aus/1/72	Tl/HK/W312/97	Qa/HK/YU1564/00	Qa/HK/YU39/01	Dk/Shantou/5540/01
Reference strains
Ty/MA/1/65	2560	5120	<	640	80	2560
Sh/Aus/1/72	80	2560	<	<	<	<
Tl/HK/W312/97	80	160	2560	2560	640	<
Qa/HK/YU1654/00	1280	<	320	2560	80	320
Qa/HK/YU39/01	160	640	40	320	2560	80
Dk/Shantou/5540/01	320	320	<	<	<	1280
2001 isolates
Qa/HK/FB611/01	1280	2560	2560	2560	640	160
Qa/HK/FB/801/01	2560	5120	2560	5120	640	160
Qa/HK/SF104/01	5120	5120	2560	5120	5120	80
Qa/HK/FY119/01	1280	2560	640	2560	320	160
Qa/HK/NT342/01	1280	2560	640	2560	320	160
Qa/HK/CSW106/01	5120	5120	2560	5120	5120	80
Gf/HK/NT897/01	2560	5120	2560	5120	640	160
Ck/HK/SF3/01	5120	5120	640	5120	320	160
Ck/HK/SF4/01	5120	5120	640	5120	320	160
Sc/HK/AP46/01	2560	5120	1280	5120	320	160
2002 isolates
Qa/HK/YU404/02	2560	2560	640	5120	640	160
Qa/HK/YU421/02	5120	5120	1280	5120	640	160
Ph/HK/SSP44/02	1280	5120	2560	2560	640	160
Gf/HK/SSP99/02	5120	5120	2560	5120	320	160
2003 isolates
Pg/HK/WF47/03	2560	5120	640	5120	160	80
Ch/HK/SF126/03	2560	2560	640	2560	80	160
Ch/HK/SF164/03	2560	2560	640	2560	80	80
Ch/HK/CSW595/03	2560	2560	640	2560	80	80

Ty: turkey; MA: Massachusetts; Sh: shearwater; Aus: Australia; Tl: teal; HK: Hong Kong; Qa: quail; Ph: pheasant; Dk: duck; Gf: guinea fowl; Sc: silky chicken; Pg: pigeon. aTiters in boldface are for homologous seta; <∶ no inhibition was detected at a serum dilution of 1 : 40.