Gene Virus

The G-Virus was a pathogen developed by William Birkin from the experiments on Lisa Trevor. People mutated with G undergo drastic mutations when injured, and the most unusual trait of the G-Virus is the production of G-Embryos. The fact that it can produce parasitic organisms directly from the host body is something wholly unique to the G-Virus. It would be useful, but unfortunately, the regenerative abilities of the virus are volatile, and any injuries suffered by infected persons will result in highly drastic changes in physiology. Mutations caused by G differ depending on the host, location of trauma, and severity of trauma. However, the continual destruction of mitochondria in the host's neurons causes an infected person to degrade to sub-human levels. The host exhibits animalistic behavior, loses moral reasoning and memory, and becomes driven by self-preservation.
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It is also worth noting that G is not viable as either a weapon nor is it safe to utilize for medical applications. G's mutations are caused by rapid mitosis at the injury site, though things such as bone growth in the hands and additional heads and limbs may be a result of the virus improperly reading or potentially damaging the genes responsible for specifying the regions of the body.
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The unusual limb growth resulting from the improper reading of specific homeobox genes may be the case, as G also seems to cause a massive increase in cell division. It is unknown if my associate would have mutated regardless of sustaining such severe injuries. However, the most common means of propagating the virus stems from G-embryos, created when a direct infectee's body produces a multitude of cancerous germ cell growths. These organisms benefit from the regenerative properties of G and are usually malformed, slug-like, or otherwise vile masses of tissue that gestate within the body of another host. These organisms are parasitic, hazardous, and share many qualities with teratomas such as organ, muscle, and bone growth. In addition, they have proven capable of growing rapidly and quickly can cause a mass effect; this, due to the unpredictable and uncontrollable cell division from within the host's body (likely abdominal cavity), will always kill the host of the G-Embryo without causing the same direct uncontrollable mutations a direct injection of the pathogen would produce. However, there is a chance the G-embryo utilizes the regenerative properties of the virus so as not to kill off the host, as it may consume the tissue to sustain itself and overgrow.