Which virus is NOT treated with acyclovir?

Acyclovir is an antiviral medication that is primarily used to treat infections caused by certain types of viruses in the herpes family. This includes Herpes simplex virus (which causes oral and genital herpes), Epstein-Barr virus (associated with infectious mononucleosis), and Varicella zoster virus (which causes chickenpox and shingles).

The influenza virus, on the other hand, is not treated with acyclovir. This virus requires different antiviral treatments that specifically target its replication mechanism. Acyclovir is ineffective against influenza because it is designed to inhibit viral DNA synthesis, a process that is not applicable to the influenza virus which is an RNA virus and employs a different mechanism for replication. Therefore, the correct answer indicates that acyclovir is not used for treating infections caused by the influenza virus.