Basically, taxonomy isn't all that meaningful for viruses. If a given cell is infected with multiple ~related viruses, various chimeric viruses will be produce

Basically, taxonomy isn't all that meaningful for viruses. If a given cell is infected with multiple ~related viruses, various chimeric viruses will be produced. Then there'll be selection on the basis of infecting other cells. And then the process repeats, until the host recovers or dies.