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Table 3 Virus titration of medicinal herb extracts against influenza H1N1 virus A/NWS/33

From: Investigation of Brassica juncea, Forsythia suspensa, and Inula britannica: phytochemical properties, antiviral effects, and safety

Plants Extract
Solvents
Virus titration (Log TCID50a/25 μL)
Total dilution (−fold)
Control 100 50 10 1b
Brassica juncea Ethanol 4.8 4.6 4.1** 3.6** 1.5**
Water 4.8 4.9 4.8 4.9 4.6
Forsythia suspensa Ethanol 4.8 4.6 3.9** 4.0** 3.5**
Water 4.8 4.6 4.3** 3.9** 3.8**
Inula britannica Ethanol 4.8 4.5 4.1** 2.5** 0**
Water 4.8 4.9 4.9 4.6 3.9**
  1. aTCID50, median tissue culture infective dose
  2. bSoluble solid concentration (B. juncea ethanol extract, 14.1 mg/mL.; B. juncea water extract, 0.3 mg/mL; F. suspensa ethanol extract, 25.8 mg/mL; F. suspensa water extract 42.4 mg/mL; I. britannica ethanol extract 18.0 mg/mL; I. britannica ethanol extract 12.8 mg/mL)
  3. Experiments were conducted in triplicate
  4. Significant differences compared to control are indicated by asterisks (**; p < 0.01)