TABLE 1.

Infectivity and lethality of the Vc_BR60 and Ym_WI01 viruses in mice

Virus	MID50 titera before adaptation	MLD50 titerb:
		Before adaptation	After adaptation
Vc_BR60	102.7	104.5	103.5
Ym_WI01	102.8	>106	105.5

^aMID₅₀, 50% mouse infectious dose (PFU).

^bMLD₅₀, 50% mouse lethal dose (PFU).