Fig. 3.

Methanol extract inhibits hemagglutinating activity of influenza virus. Cell culture with virus and different concentrations of the extract from pre exposure, simultaneous exposure and post exposure experiments were added in 96-well plate with equal amount of guinea pig erythrocytes (0.75 %) and incubated for 1 h. We observed that at concentration of 15–1 mg/mL of methanol extract reduces HA activity of virus from 64 to no HA titre, indicating an interaction of methanol extract with the viral HA