I’ve been thinking about this for a while now. What would happen if a Viltrumite donated blood to someone? Would that person then develop Viltrumite powers? Or would they die due to the blood not being human or not matching the blood type? Since Viltrumite blood is so pure and compatible, the human would slowly but surely become a Vilturmite.
The human body can’t even accept an incompatible blood type from another human. Viltrumite blood would probably have an even worse effect.