A pandemic influenza antiviral agent, containing as an active ingredient an extract obtained by extracting Chinese quince using 50% ethanol-water and purifying the extract solution by column fractionation.一種抗新型流行性感冒病毒劑,其特徵係以使用50%乙醇水萃取光皮木瓜,並藉由將其萃取液進行管柱區分以精製而得之萃取物作為有效成分。