Table 2.

Antivirus activity of the sample against the BVD virus

Sample	Concentration (ug/ml)					**MNTD (ug/ml)
	10	20	40	80	160
EA	-	++	++	++	++	18.2
*control (P.C)	-
†control (N.C)	-

^**MNTD: Maximum nontoxic dose;

^*P.C: Positive control(Amantadine);

^†N.C: Negative control(DMSO) ++: Strong toxicity; +: Toxicity; -: Non-toxicity.