Table 2 Isolation for H9N2 viruses of tracheal and cloacal swabs in chickens in transmission experiment

F/98

Directly inoculation^a

9/9(3.3 ± 0.2)

6/9(1.85 ± 0.2)

0/9

0/9

2/9(1.65 ± 0.1)

6/9(1.8 ± 0.4)

3/9(<1^c)

5 ± 0.7

9 ± 0.5

Airborne contact^a

2/9(1.7 ± 0.1)

4/9(<1^c)

2/9(<1^c)

0/9

4/9(1.1 ± 0.1)

2/9(<1^c)

0/9

3 ± 1.9

9 ± 0.3

nF47

Directly inoculation^a

9/9(5.3 ± 0.4)

9/9(3.45 ± 0.3)

9/9(1.65 ± 0.2)

6/9(<1^c)

4/9(2.4 ± 0.3)

7/9(1.3 ± 0.1)

3/9(<1^c)

6 ± 0.4

10 ± 0.2

Airborne contact^a

5/9(3.5 ± 0.1)

7/9(2.5 ± 0.3)

2/9(<1^c)

2/9(<1^c)

3/9(1.6 ± 0.2)

0/9

0/9

7 ± 1.5

9 ± 2.9

VF47

Directly inoculation^a

9/9(4.2 ± 0.3)

9/9(2.5 ± 0.3)

0/9

0/9

2/3(2.45 ± 0.3)

7/9(1.5 ± 0.1)

2/9(1.15 ± 0. 2)

7 ± 0.2

10 ± 0.6

Airborne contact^a

5/9(2.2 ± 0.4)

7/9(1.2 ± 0.1)

6/9(<1^c)

0/9

3/9(1.9 ± 0.1)

7/9(1.1 ± 0.5)

3/9(<1^c)

7 ± 2.6

10 ± 1.1

nF52

Directly inoculation^a

9/9(3.8 ± 0.2)

9/9(4.1 ± 0.2)

6/9(2.6 ± 0.1)

0/9

4/9(2.9 ± 0.3)

6/9(2.2 ± 0.3)

3/9(<1^c)

7 ± 0.8

10 ± 1.7

Airborne contact^a

0/9

0/9

0/9

0/9

0/9

0/9

0/9

0

0