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. 2011 Feb 10;8:64. doi: 10.1186/1743-422X-8-64

Table 1.

Growth potential in MDCK cells and pathogenicity for chicken of each virus

Viruses Plaque formation (log PFU/ml) Pathogenicity (number of dead/sick/total )


With trypsin Without trypsin 3-day-old chicks (air sac inoculation) 4-week-old chickens (intravenous inoculation)
rgY55 (H9N2) 8.1 -a NTb 0/0/8
rgY55sub (H9N2) 8.0 - 0/0/3 0/0/8
rgY55sub-P5 (H9N2) 7.6 - 0/0/4 0/0/8
rgY55sub-P6 (H9N2) 7.2 6.7 3/3/3 0/1/8
rgY55sub-P7 (H9N2) 7.8 7.5 3/3/3 0/5/8
rgY55sub-P8 (H9N2) 7.6 7.6 3/3/3 2/7/8 (4.0)c
rgY55sub-P9 (H9N2) 7.2 6.9 3/3/3 1/8/8 (10.0)
rgY55sub-P10 (H9N2) 6.5 6.1 3/3/3 6/8/8 (1.8)
rgVac1 (H5N1) 7.6 - NT 0/0/8
rgVac1sub (H5N1) 7.6 7.8 0/0/3 0/1/8
rgVac1sub-P1 (H5N1) 6.8 6.8 3/3/3 3/5/8 (5.3)
rgVac1sub-P2 (H5N1) 6.4 6.5 6/6/6 8/8/8 (2.6)
rgVac1ins (H5N1) 7.3 - 0/0/3 0/0/8
rgVac1ins-P1 (H5N1) 7.8 7.1 3/3/3 6/7/8 (6.8)
rgVac1ins-P2 (H5N1) 7.1 7.1 4/4/4 6/8/8 (4.4)

a A plaque was not observed.

b Not tested.

c Mean death days are shown in parentheses.

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