TABLE 7.

Transmission of A/HK/1073/99 (H9N2) among quail

Day after contact	No. infected (virus titer [log10/ml])
	Infected quaila		Physical contactb		Fecal contactc		Aerosol contactd
	Trachea	Cloaca	Trachea	Cloaca	Trachea	Cloaca	Trachea	Cloaca
2	2 (2.8)	0 (<e)	2 (4.8)	0	4 (4.8)	0	0	0
4	2 (2.8)	0 (<)	2 (NTf)	2 (<1.0)	4 (NT)	1 (<1.0)	2 (4.5)	0
6	2 (4.5)	0 (<)	2 (4.5)	0 (<)	4 (4.5)	1 (<1.0)	4 (2.0)	0
9	2 (<1.0)	0 (<)	2 (2.0)	2 (<1.0)	4 (2.5)	0	4 (2.0)	3 (<1.0)
11	0	0	0	0	0	0	0	0

^aTwo quail were infected with A/HK/1073/99 (H9N2). 

^bThe two infected quail were put into a cage with two contact quail. 

^cFour quail were put into a cage below the infected birds with the litter tray removed. 

^dFour quail were put into a cage at the same level as the infected birds but separated by 1 ft. Airflow was from the bottom and out through top filters. 

^e<, below the level of detection. 

^fNT, not tested.