The invention relates to virology and the prevention and/or treatment of viral infection and disease in animals, including birds and humans. The invention relates to the field of antiviral treatments. The invention further relates to methods of stimulating innate immunity and natural interferon production in humans or animals and in component parts of humans or animals, including cells and tissues. The invention also relates to the field of defective interfering (Dl) viruses, including cloned Dl viruses.
