Virofage rifle and Infiltrator

So the rifle has a base damage plus a virofage damage.

In respect of the last infiltrator skill, how is the virofage rifle calculated?

Is it like additional instantaneous poison damage, independent from base damage? Or is the virofage added to base damage and multiply by the skill?

What about piercing factor? I just thought it ignores armour vs Pandorans, but is just a notion

What about using virofage vs human factions?

Or in other words, how does a virofage rifle compares to a Raven?

(sorry I can’t remember the skill names or the rifle stat numbers and I am not at the pc).

Thank you guys.

It has basically the same damage as the Pythagoras VII

Thank you. Nice chart!