TABLE 4.

Replication and transmission of A/Gs/HK/99 (H5N1) virus in ducksa

Virus strainMethod of transmissionVirus shedding on postinfection day: signs
35
TracheaCloacaTracheaCloaca
No. of birds shedding/totalInfectivity titer (log10/0.1 ml) rangeNo. of birds shedding/totalInfectivity titer (log10/0.1 ml) rangeNo. of birds shedding/totalInfectivity titer (log10/0.1 ml) rangeNo. of birds shedding/totalInfectivity titer (log10/0.1 ml) range
Gs/HK/437-4/99Inoculation2/4≤2.0–≥5.22/4≤2.0–2.22/4≤2.0–2.54/4≤2.2–3.3
Contact2/22.2–3.51/22.0–2.50/2<b1/2≤2.0–≤2.2
Gs/HK/437-6/99Inoculation4/42.8–≥5.54/43.5–4.20/4<2/4≤2.0–2.5
Contact1/2≤2.0–2.51/2≤2.0–≥5.20/2<1/2≤2.0–≤2.2
  • a Ducks were inoculated with approximately 106.5 EID50 as given in Materials and Methods. No inoculated ducks exhibited signs of disease.

  • b <, no detectable virus.