Table 2.

Virus titers in trachea or lung tissues of infected chickens

Groups	3 dpi		5 dpi
	Lung	Trachea	Lung	Trachea
rH9N1	1/3a (4.25)	3/3 (4.5 ± 0.90b)	0/3	3/3 (2.5 ± 0.00)
H9N2	2/3 (3.75 ± 0.71)	3/3 (4.5 ± 0.00)	3/3 (3.58 ± 0.14)	3/3 (4.42 ± 0.14)
rH9N3	1/3 (1.5)	1/3 (3.5)	2/3 (3.25c)	2/3 (2.25c)

^aThe number of chickens positive for virus isolation out of the total number of chickens on the days indicated.

^bThe virus titers presented by log₁₀ mean ± SEM EID₅₀/100 mg among positive samples.

^cTwo chickens shed virus, one of them has titer below the detection limit.