TABLE 6.

Airborne transmission of 18 arbitrarily chosen prevalent H9N2 viruses

Virus and group	Virus shedding on daya:				Seroconversionb (HI titer)	Airborne transmissibility
	3	5	7	9
SH2
Inoculated	3/4	4/4	2/4	0/4	4/4 (40, 160, 160, 320)	−
Exposed	0/4	0/4	0/4	0/4	0/4 (<10, <10, <10, <10)
SH3
Inoculated	4/4	3/4	2/4	0/4	4/4 (80, 320, 320, 640)	−
Exposed	0/4	0/4	0/4	0/4	0/4 (<10, <10, <10, <10)
SH101
Inoculated	2/4	4/4	4/4	0/4	4/4 (160, 320, 640, 640)	−
Exposed	0/4	0/4	0/4	0/4	0/4 (<10, <10, <10, <10)
SH1
Inoculated	4/4	4/4	1/4	0/4	4/4 (1,280, 1,280, 1,280, 1,280)	+
Exposed	4/4	4/4	3/4	1/4	4/4 (160, 320, 640, 640)
SH302
Inoculated	3/4	4/4	4/4	1/4	4/4 (320, 640, 640, 640)	−
Exposed	0/4	0/4	0/4	0/4	0/4 (<10, <10, <10, <10)
HN13
Inoculated	3/4	4/4	4/4	0/4	4/4 (320, 320, 640, 640)	+
Exposed	0/4	0/4	2/4	1/4	2/4 (<10, <10, 20, 80)
SD01
Inoculated	4/4	4/4	3/4	0/4	4/4 (640, 640, 640, 1,280)	−
Exposed	0/4	0/4	0/4	0/4	0/4 (<10, <10, <10, <10)
JS08
Inoculated	4/4	3/4	4/4	4/4	4/4 (320, 640, 640, 1,280)	+
Exposed	1/4	4/4	4/4	4/4	4/4 (80, 160, 320, 320)
SD07
Inoculated	3/4	4/4	1/4	0/4	4/4 (40, 160, 320, 640)	−
Exposed	0/4	0/4	0/4	0/4	0/4 (<10, <10, <10, <10)
FJ09
Inoculated	4/4	4/4	4/4	3/4	4/4 (320, 320, 640, 640)	+
Exposed	0/4	0/4	3/4	1/4	3/4 (<10, 40, 80, 80)
AH03
Inoculated	2/4	3/4	4/4	1/4	4/4 (160, 320, 640, 1,280)	−
Exposed	0/4	0/4	0/4	0/4	0/4 (<10, <10, <10)
WJ19
Inoculated	4/4	4/4	4/4	0/4	4/4 (640, 640, 1,280, 1,280)	+
Exposed	0/4	4/4	4/4	4/4	4/4 (20, 80, 160, 320)
ZJ607
Inoculated	4/4	4/4	2/4	0/4	4/4 (640, 640, 1,280, 1,280)	+
Exposed	0/4	2/4	4/4	4/4	4/4 (160, 320, 320, 1,280)
QD4
Inoculated	4/4	4/4	4/4	1/4	4/4 (320, 320, 640, 640)	+
Exposed	3/4	0/4	0/4	1/4	3/4 (<10, 20, 160, 160)
WJ101
Inoculated	3/4	0/4	3/4	1/4	3/4 (80, 160, 320, 640)	+
Exposed	0/4	4/4	1/4	1/4	2/4 (<10, <10, 40, 80)
NG22
Inoculated	4/4	4/4	4/4	4/4	4/4 (160, 320, 320, 640)	+
Exposed	1/4	1/4	2/4	4/4	4/4 (80, 320, 320, 640)
QD6
Inoculated	4/4	4/4	4/4	3/4	4/4 (320, 640, 640, 1,280)	+
Exposed	4/4	4/4	3/4	1/4	4/4 (320, 320, 640, 640, 1,280)
WJ57
Inoculated	4/4	4/4	3/4	3/4	4/4 (160, 640, 1,280, 1,280)	+
Exposed	3/4	4/4	2/4	2/4	4/4 (80, 80, 320, 320)

^aThe number of days after chickens were inoculated/exposed. Data are numbers of chickens shedding virus/total number of chickens.

^bHI antibody titers of chickens on day 21 postinoculation/postexposure.