Interferon
Interferon : A naturally occurring chemical (protein) in the body that helps the immune system to clear viruses such as hepatitis B or C. Our livers produce at least 26 types of natural interferon. Produced by body cells in response to invasion by viruses and other intracellular parasites; it interferes with the synthesis of new virus and is effective against certain protozoal parasitic infections. Any of a group of heat-stable soluble basic antiviral glycoproteins of low molecular weight that are produced usually by cells exposed to the action of a virus, sometimes to the action of another intracellular parasite (such as bacterium), or experimentally to the action of some chemicals, and that include some used medically as antiviral or antineoplastic agents