TABLE 3.

Replication of H5N1/02-03 influenza viruses in mallards

VirusInoculation dose (log10 EID50)Detection of H5N1 virus at different times after infection
Day 3 p.i.Day 5 p.i.
Inoculated ducksbContact ducksbDrinking wateraInoculated ducksContact ducksDrinking water
TracheaCloacaTracheaCloacaTracheaCloacaTracheaCloaca
HK/156/975.752/2 (3.2)2/2 (2.4)1/2 (1)0/20/20/21/2 (1)1/2 (<1)
Ck/HK/220/978.52/2 (<1)1/2 (<1)1/2 (<1)0/20/20/20/22/2 (3.5)
Ck/HK/YU562/018.52/2 (4.5)1/2 (3.5)2/3 (<1)0/3+ (1)0/20/22/3 (<1)3/3 (<1)+ (<1)
Ck/HK/FY150/018.252/2 (3.4)2/2 (3.0)1/2 (<1)0/2+ (<1)1/2 (3.8)2/2 (2.2)2/2 (4.2)2/2 (2.5)
Ph/HK/FY155/018.252/2 (3.0)2/2 (4.4)1/3 (<1)3/3 (2.3)+ (<1)0/1d1/1d (<1)3/3 (5.0)3/3 (3.5)+ (2.5)
Ck/HK/822.2/018.252/2 (3.9)1/2 (<1)0/20/2+ (<1)2/2 (2.5)0/20/20/2
A/Ck/HK/873.3/017.52/2 (4.2)2/2 (<1)1/2 (3.5)2/2 (2.5)+ (<1)2/2 (3.7)1/2 (2.8)2/2 (4.5)2/2 (2.2)+ (<1)
Ck/HK/86.3/028.252/2 (4.7)1/2 (2.5)NDcND+ (2.3)1/2 (<1)0/2NDND
Teal/HK/2978.1/027.752/2 (5.0)2/2 (<1)2/2 (5.0)2/2 (2.2)+ (3.5)2/2 (1)0/22/2 (3.4)1/2 (2.3)+ (3.5)
RB poch/HK/821/026.52/2 (4.3)0/22/2 (3.7)1/2 (<1)+ (3.3)0/0d0/0d2/2 (4.5)1/2 (2.3)+ (2.3)
Gs/HK/739.2/027.753/3 (5.7)3/3 (2.2)3/3 (5.6)2/3 (2.6)+ (3.5)1/1d (2.3)0/1d0/0d0/0d+ (<1)
HK/213/037.52/2 (5.6)2/2 (<1)1/2 (2.3)1/2 (<1)+ (<1)1/2 (<1)1/2 (2.5)0/21/2 (<1)
  • a Shared drinking water was tested for influenza virus (+, positive; −, negative). Positive samples were subsequently subjected to titer determination for infectious virus (virus titer [log10 EID50/milliliter]).

  • b Number shedding/number sampled (virus titer [log10 EID50/milliliter]). The virus titer is the mean of positive samples.

  • c ND, not determined.

  • d Ducks died.