Verwendungeines Extrakts aus Pflanzen der Gattung Cistus zur Herstellung einesMedikaments zur Prophylaxe und/oder Behandlung von Influenza.Use of a plant extract from Cistus species for the production of a medicine to treat and/or prevent influenza, is new. ACTIVITY : Virucide. The antiviral activity of (I) was tested in A549 lung epithelium cells. The result showed that the extract (10 mu g) at 36 hours inhibited the viral activity totally. MECHANISM OF ACTION : None given.