TABLE 2.

Replication of H5N1/03 and -04 influenza viruses in mallards

Pathogenicity in ducks and strainDetection of H5N1 virus at different times after inoculationa
Day 3 postinoculationDay 5 postinoculation
Inoculated ducksContact ducksInoculated ducksContact ducks
TracheaCloacaTracheaCloacaTracheaCloacaTracheaCloaca
Low-pathogenicity group
    A/Ck/HK/NT71/032/2 (2.6)2/2 (<1)2/2 (<1)1/2 (<1)0/20/22/2 (<1)0/2
    A/Ck/HK/AP111/032/2 (5.9)2/2 (<1)0/20/21/2 (1.0)0/22/2 (4.2)1/2 (1.0)
    A/Ck/HK/YU250/032/2 (3.2)2/2 (<1)0/20/20/20/20/20/2
    A/Falcon/HK/D0028L/042/2 (5.2)2/2 (<1)0/20/22/2 (<1)0/21/2 (<1)0/2
    A/Ck/AH/85/042/2 (4.0)2/2 (2.8)2/2 (1.0)1/2 (1.0)2/2 (1.0)2/2 (<1)2/2 (2.3)0/2
    A/Ck/PP/BPPV3/042/2 (3.5)2/2 (2.5)2/2 (1.0)1/2 (1.0)1/2 (<1)1/2 (1.0)2/2 (3.5)2/2 (2.3)
    A/VN/3046/042/2 (2.5)2/2 (1.0)2/2 (1.0)0/22/2 (1.0)2/2 (<1)2/2 (3.3)2/2 (<1)
    A/Thai/1(Kan-1)/042/2 (5.5)2/2 (2.3)2/2 (1.0)2/2 (<1)2/2 (<1)1/2 (<1)1/2 (2.5)2/2 (<1)
High-pathogenicity group
    A/Ph/HK/NT123/032/2 (<1)0/22/2 (<1)1/2 (<1)2/2 (<1)0/22/2 (4.0)1/2 (<1)
    A/Ck/HK/SSP94/032/2 (3.2)0/21/2 (<1)0/22/2 (2.5)0/22/2 (<1)1/2 (<1)
    A/Ck/HK/WF27/032/2 (5.0)1/2 (3.0)2/2 (1.0)1/2 (<1)2/2 (3.4)1/2 (1.0)2/2 (3.8)1/2 (<1)
    A/Ck/VN/133/042/2 (4.8)2/2 (2.5)1/1 (3.8)1/1 (2.3)1/2 (<1)1/2 (<1)1/1 (3.8)1/1 (1.0)
    A/Ck/VN/48C/042/2 (3.3)2/2 (3.5)2/2 (3.5)2/2 (2.3)1/2 (1.0)1/2 (1.0)2/2 (3.5)2/2 (1.0)
    A/Dk/VN/40D/042/2 (4.3)2/2 (1.0)0/20/21/1b (2.8)0/1b2/2 (3.3)1/2 (<1)
    A/Pigeon/HK/WF32/032/2 (4.6)2/2 (<1)2/2 (3.0)2/2 (<1)1/1b (3.25)0/1b1/1b (1.0)1/1b (<1)
    A/S.Ck/HK/YU17/032/2 (4.6)1/2 (<1)2/2 (5.0)2/2 (2.5)1/1b (3.25)0/1bbb
    A/Ck/HK/YU46/032/2 (4.4)2/2 (<1)2/2 (<1)2/2 (<1)1/1b (2.0)1/1b (<1)1/1b (2.8)1/1b (<1)
    A/Ck/HK/SSP171/032/2 (3.0)2/2 (<1)2/2 (<1)2/2 (<1)bb2/2 (<1)2/2 (1.7)
    A/S.Ck/HK/SSP7/032/2 (5.4)2/2 (<1)2/2 (4.2)2/2 (2.9)bb2/2 (4.6)2/2 (2.7)
    A/Mal/VN/16D/032/2 (4.3)2/2 (1.0)1/1 (3.5)1/1 (2.5)1/1b (<1)1/1b (2.5)bb
    A/Ck/VN/C58/042/2 (<1)1/2 (<1)0/20/21/2 (2.25)1/2 (<1)2/2 (4.0)1/2 (<1)
    A/VN/1203/042/2 (3.8)2/2 (<1)2/2 (<1)2/2 (<1)2/2 (4.9)2/2 (<1)2/2 (2.9)2/2 (<1)
    A/Dk/Thai/71.1/041/1b (1.0)1/1b (2.0)1/1b (2.5)0/1bbb1/1b (4.3)0/1b
  • a Number shedding/number sampled (virus titer, log10 EID50/ml). Virus titer is the average of positive samples

  • b Ducks died.