Table 3. Clinical signs, virus replication and seroconversion in direct and aerosol contact ferrets.

Virus	Direct contact ferrets			Aerosol contact ferrets
	Virus detected in nasal washa	Sneezing (Day of onset)	Serum (HI titer) b	Virus detected in nasal washa	Sneezing (Day of onset)	Serum (HI titer) b
RGWF10c	3/3	0/3	320, 320, 640	NDd	ND	ND
RGWF10	2/2	0/2	640, 1280	0/2	0/2	<10, <10
Dk/HK/Y280/97	1/2	0/2	640, <10	ND	ND	ND
RGQa88	0/2	0/2	<10, <10	ND	ND	ND
Ck/HK/SF3/99	0/2	0/2	<10, <10	ND	ND	ND
Ck/Jordan/554/03	0/2	0/2	<10, <10	ND	ND	ND
RGMemphis98	2/2	2/2 (4, 4)	5120, 5120	2/2	2/2 (8,10)	2560, 5120
2WF10:6M98	2/2	2/2 (4, 5)	1280, 1280	0/2	0/2	<10, <10

^aVirus in nasal washes was analyzed using FLU DETECT™ Antigen Capture Test Strip (Synbiotics Corp.) and titrated by TCID₅₀.

^bHomologous virus was used in the HI assays to detect anti-H9 antibodies.

^cFor the RGWF10 virus, two separate experiments were performed.

^dND, not done.