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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	<10^1.5
tk/WI/68 (H5N9)	Chicken embryo	nd	4/4	4/4	4/4	4/4	nd	>10^6.5
tk/ON/6213/66 (H5N1)	Mouse	nd	nd	nd	nd	3/4	1/4	10^6.5
tk/WI/68 (H5N9)	Mouse	nd	nd	nd	nd	4/4	nd	>10^6.5

^*

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