In vitro antiviral activity of plant extracts from Asteraceae medicinal plants

Table 2 Screening of antiviral activity of plant extracts

Plant name	Extracts	Yield (%)	BVDV	HSV-1	PV-2	VSV
Baccharis gaudichaudiana	OE	29	-	-	+	+
Baccharis gaudichaudiana	AE	10	-	+	-	-
Baccharis spicata	OE	15.5	-	-	+	+
Baccharis spicata	AE	9	-	+	-	-
Bidens subalternans	OE	8.4	-	-	-	-
Bidens subalternans	AE	6.3	-	-	-	-
Pluchea sagittalis	OE	11	-	+/−	-	+/−
Pluchea sagittalis	AE	11	-	-	-	-
Tagetes minuta	OE	7.5	-	-	+/−	-
Tagetes minuta	AE	7.8	-	-	-	-
Tessaria absinthioides	OE	13.5	-	-	+	-
Tessaria absinthioides	AE	15.3	-	+	-	-

The antiviral activity was tested by the reduction of viral cytopathic effect (CPE) assays.
(+) positive: reduction of viral CPE higher than 50% at both concentrations tested.
(+/−) positive/negative: reduction of viral CPE only achieved at 100 μg/ml.
(−) negative: without protection at 25 and at 100 μg/ml.
OE organic extract, AE, aqueous extract.
Yield (% w/w = g of extracts/100 g of dried and ground plant material).

ISSN: 1743-422X