Invasive Procedures (2007) is a medical thriller by American writers Orson Scott Card and Aaron Johnston.

Galen takes his research underground, eventually devising a virus that can carry specific genes into human cells.

It can cure that patient of a genetic disorder - but it is quickly lethal to anyone else, inducing a serious rejection reaction as their body responds to its attempt to rewrite the host's DNA.

Upon discovering this cure, Hartman learns that his original samples came to the Defense Department from the BioHazard Agency (BHA) a branch of the government that handles biowarfare attacks.

When the V16 has finished rewriting the genetic code, it will activate the chip which will download Galen's personality over that of the original individual.