Table 1.

Effects of plant extracts on SARS-CoV

Plant extract	Family	Part used	Solvent	CC50a	Viral strain
					BJ-001		BJ-006
					EC50b	SIc	EC50b	SIc
Lycoris radiata	Amaryllis	Stem cortex	Ethanol	886.6 (±35.0)	2.4 (±0.2)	370	2.1 (±0.2)	422
Artemisia annua	Compositae	Whole plant	Ethanol	1053.0 (±92.8)	34.5 (±2.6)	31	39.2 (±4.1)	27
Pyrrosia lingua	Polypodiaceae	Leaf	Chloroform	2378.0 (±87.3)	43.2 (±14.1)	55	40.5 (±3.7)	59
Lindera aggregate	Lauraceae	Root	Ethanol	1374.0 (±39.0)	88.2 (±7.7)	16	80.6 (±5.2)	17
Interferon alpha				>100,000 (±710.1)	660.3 (±119.1)	>151	587.2 (±39.0)	>170

^aDetermined as the concentration of the compounds that reduced the cell viability to 50% of control (cells without addition of compound). Each represents the mean value from three independent experiments. The unit for CC₅₀ values shown in the table is μg/ml except interferon alpha, which is IU/ml.

^bDetermined as the concentration of the compounds needed to inhibit CPE to 50% of control value (cells without viral infection). Each represents the mean value from three independent experiments. The unit for EC₅₀ values shown in the table is μg/ml except interferon alpha, which is IU/ml.

^cSelectivity index (CC₅₀/EC₅₀).