Table 2.

Anti-influenza A virus effects of some medicinal plants extracts and fractions

Plant	Extracts or Fractions	Concentration in DMSO	CC50 (μg/ml)	NCTC (μg/ml) & EC50 (μg/ml)	Selectivity index (SI = CC50/EC50)
Glycyrrhiza glabra	Crude E.	100 mg/ml	881.87 ± 0.03	55.12	16
Glycyrrhiza glabra	Chloroform F.	100 mg/ml	5.19 ± 0.00	2.57	2
Glycyrrhiza glabra	Methanol F.	100 mg/ml	3529.48 ± 0.76	441.12	8
Myrtus communis	Crude E.	100 mg/ml	10.40 ± 0.00	2.60	4
Myrtus communis	Chloroform F.	100 mg/ml	2.60 ± 0.00	0.65	4
Myrtus communis	Methanol F.	100 mg/ml	603.67 ± 0.60	37.73	16
Melissa officinalis	Crude E.	100 mg/ml	1813.99 ± 0.23	113.37	16
Melissa officinalis	Chloroform F.	100 mg/ml	1427.10 ± 0.45	44.62	32
Melissa officinalis	Methanol F.	100 mg/ml	4413.80 ± 3.69	551.72	8
Hypericum perforatum	Crude E.	100 mg/ml	10.41 ± 0.00	1.30	8
Hypericum perforatum	Chloroform F.	100 mg/ml	10.99 ± 0.00	2.75	4
Hypericum perforatum	Methanol F.	100 mg/ml	3929.08 ± 2.47	122.7	32
Tilia platyphyllos	Crude E.	100 mg/ml	152.26 ± 0.50	9.56	15.92
Tilia platyphyllos	Chloroform F.	100 mg/ml	267.45 ± 8.8	16.69	16.03
Tilia platyphyllos	Methanol F.	100 mg/ml	277.56 ± 3.19	34.62	8.02
Salix alba	Crude E.	100 mg/ml	3647.45 ± 52.52	113.70	32
Salix alba	Chloroform F.	100 mg/ml	1755.28 ± 0.89	219.37	8
Salix alba	Methanol F.	100 mg/ml	2816.86 ± 77.80	88.03	32
Camellia sinensis	Crude E.	100 mg/ml	161.89 ± 2.30	20.25	8
Camellia sinensis	Chloroform F.	100 mg/ml	13.28 ± 0.00	1.62	8.17
Camellia sinensis	Methanol F.	100 mg/ml	877.28 ± 3.80	27.41	32
Camellia sinensis)fermented(	Crude E.	100 mg/ml	1038.192 ± 88.73	129.87	8
Camellia sinensis)fermented(	Chloroform F.	100 mg/ml	875.61 ± 7.55	109.50	8
Camellia sinensis)fermented(	Methanol F.	100 mg/ml	405.13 ± 3.71	50.62	8
Amantadine hydrochloride	–	2000 μg/ml H2O	197.001 ± 1.533	98.500	2
Oseltamivir carboxylate	–	4000 μg/ml H2O	788.505 ± 6.006	394.250	2

CC₅₀ 50% cytotoxic concentration, EC₅₀ 50% effective concentration, NCTC non-cytotoxic concentrations (EC₅₀ and NCTC values were equal), SI Selectivity Index