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. 2012 Aug;93(Pt 8):1649–1657. doi: 10.1099/vir.0.042895-0

Table 3. tk/ON/6213/66 (H5N1) is more virulent than tk/WI/68 (H5N9) by assay of survival of infected chicken embryos and mice.

nd, Not done.

Virus Host Dose (p.f.u.)* LD50
102 103 104 105 106 107
tk/ON/6213/66 (H5N1) Chicken embryo 0/4 0/4 0/4 0/4 0/4 nd <101.5
tk/WI/68 (H5N9) Chicken embryo nd 4/4 4/4 4/4 4/4 nd >106.5
tk/ON/6213/66 (H5N1) Mouse nd nd nd nd 3/4 1/4 106.5
tk/WI/68 (H5N9) Mouse nd nd nd nd 4/4 nd >106.5
*

Survivors are indicated as the fraction of total mice or embryos infected with each dose.