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Table 2 Direct antiviral action of plant extracts against influenza A virus A/Teal/Tunka/7/2010 (H3N8)

From: Evaluation of direct antiviral activity of the Deva-5 herb formulation and extracts of five Asian plants against influenza A virus H3N8

Extract

NI ± SD*

ID50%**

Gentiana decumbens, 1% extract

1.4 ± 0.7

-

Hypecoum erectum, 1% extract

4.8 ± 0.2

8.6

Polygonum bistorta, 1% extract

1.6 ± 0.1

-

Terminalia chebula, 0.5% extract

4.9 ± 0.2

13.4

Momordica cochinchinensis, 0.5% extract

5.1 ± 0.3

2.7

DEVA-5, 1% extract

1.6 ± 0.4

-

H3N2 Abs, diluted as 1:100

93.9 ± 0.7

59.1

  1. * - approximately 1 × 105 PFU of A/Teal/Tunka/7/2010 (H3N8) were used for the NI assay.
  2. ** - approximately 200 PFU of A/Teal/Tunka/7/2010 (H3N8) were used for the PRNT assay.
  3. The neutralisation index (NI) was estimated as the quotient of the virus concentration in the water-treated sample to the virus concentration in the test sample. The 50% inhibition dose was estimated using probit analysis as the maximal reciprocal dilution of extract that inhibited the formation of plaques by 50%.