Pathogenicity of reassortant H9 influenza viruses with different NA genes in mice and chickens

Table 1 Virus shedding and seroconversion of chickens infected with reassortant viruses on the indicated dpi

Groups	3 dpi		5 dpi		7 dpi		Seroconversion (HI titer)
Groups	Oropharyngeal	Cloaca	Oropharyngeal	Cloaca	Oropharyngeal	Cloaca	Seroconversion (HI titer)
rH9N1	3/3^a (1.58 ± 0.14^b)	2/3^c	2/3	3/3	1/3	0/3	3/3^d (245 ± 153)
H9N2	3/3 (3.33 ± 0.72)	2/3	3/3 (2.25 ± 0.66)	2/3	1/3	2/3	3/3 (512)
rH9N3	3/3 (2.25 ± 1.39)	0/3	3/3 (1.92 ± 0.52)	0/3	0/3	0/3	3/3 (1365 ± 529)

^aThe number of chickens shedding virus out of total numbers.
^bThe virus titers presented by log₁₀ geometric mean ± SEM EID₅₀/100 μL among positive samples.
^cTwo chickens shed virus, the titers are below the detection limit.
^dThe number of chickens that were seropositive out of total numbers on day 14 dpi, HI titers presented by geometric mean HI values ± SEM.

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