In vitro antiviral activity of fifteen plant extracts ...- pdf of sanitizer from plant extracts with antiviral properties ,Cytotoxicity of plant extracts. All the extracts were more cytotoxic (P < 0.05) than the ethanol control (7.7 μl).A. foeniculum showed the highest cytotoxic concentration (0.062 μg) and P. frutescens (0.77 μg) showed the lowest one.. Antiviral effect against IBV. According to the results of the antiviral effect assay, eight extracts were selected for determination of the virucidal effect.20 of the Best Antiviral and Antibacterial Herbs and ...2. Ginger. Yep, this is another herb that you most likely have in your kitchen. This commonly used herb is well-known for its antibacterial and antiviral compounds.You can add fresh ginger to your meals, taken in capsule form as a supplement, or consumed as a tea.