The strategy is to look for unique processes that occur in virus infected cells but not uninfected cells. Look at some of the enzymes encoded by viruses, and the processes they catalyze to find ideas for inhibiting virus replication.Antiviral drug, any agent that is used in the treatment of an infectious disease caused by a virus. Viruses are responsible for illnesses such as HIV/AIDS, influenza, herpes simplex type I (cold sores of the mouth) and type II (genital herpes), herpes zoster (shingles), viral hepatitis, encephalitis, infectious mononucleosis, and the common cold.