Which is generally accepted to be the first computer virus ?

Creeper

Creeper was an experimental self-replicating program written by Bob Thomas at BBN  in 1971. It was designed not to damage but only to display a message.It is generally accepted to be the first computer worm.Creeper infected DEC PDP-10 computers running the TENEX operating system. The Reaper program was created by Ray Tomlinson to delete the Creeper program.