interferon

Any of a group of glycoproteins that are produced by different cell types in response to various stimuli, such as exposure to a virus, bacterium, parasite, or other antigen, and that prevent viral replication in newly infected cells and, in some cases, modulate specific cellular functions.

Any of a group of glycoproteins, produced by the immune system, that prevent viral replication in infected cells

an antiviral protein produced by cells that have been invaded by a virus; inhibits replication of the virus