TABLE 2.

Transmission of recombinant H9N2 viruses in quail and chickens

VirusNo. of positive tracheae/total no. of birds (log10 EID50/ml for each bird)
QuailChickens
InoculatedaDirect contactbInoculatedaDirect contactb
RG HA Qa/88 × Dk/783/3 (3.8, 1.8, 2.5)3/3 (3.5, 5.3, 5.0)3/3 (1.3, <1.0, <1.0)1/3 (<1.0)
RG HA, NA Qa/88 × Dk/783/3 (4.8, 4.3, 2.8)3/3 (5.5, 5.3, 5.5)3/3 (2.8, <1.0, 3.5)0/3
RG HA Gfowl/99 × Dk/783/3 (1.8, 1.5, 4.8)3/3 (2.3, 2.5, 1.0)3/3 (<1.0, <1.0, <1.0)0/3
RG HA, NA Gfowl/99 × Dk/783/3 (3.8, 3.8, 4.8)3/3 (5.3, 5.5, 3.8)3/3 (1.5, <1.0, 2.8)0/3
RG Gfowl/996/6 (4.0 ± 1.0)c6/6 (3.5 ± 0.5)c6/6 (4.0 ± 1.0)c4/6 (2.5 ± 0.5)c
RG Dk/783/3 (2.5, 2.0, 3.0)0/30/30/3
  • a Titers in parentheses correspond to each bird in the group 3 days after inoculation.

  • b Titers in parentheses correspond to each bird in the group 5 to 7 days after inoculation.

  • c Results of two independent experiments. Mean titers and standard deviations are shown.