Pathogen virus work in a simple way: they inoculate their genes (DNA or RNA) in the host cells and let them replicate huge amounts of the attacker while hampering the host vital functions. As reaction the host fights back, until either the host or the guest is dead.
I am trying to figure out a "smart" virus, which only inoculates its genes and does no alteration of the host metabolism.
It targets any cell, but has a predilection for the gonad cells, so that whenever the host mates will also transfer the virus to the offspring. Bonus of this scenario is that the offspring will see the virus as "self", so won't even try to defeat it.
Is this a realistic scenario or am I neglecting something?