A necrovirus is one of many viruses that cause undeath.

Many undead have methods of propagating their curse among their previously living victims. For instance, those infected by the diseased bite of a ghoul may contract ghoul fever. Those who perish from this rotting illness rise at the next midnight as ghouls themselves. In this way, some undead recruit the formerly living into their shuffling ranks.

Undead propagate in a sick parody of life’s method of multiplying. Worse yet, undead proliferation is far quicker, easier, and doesn’t require the consent of the creature to be made undead—only a victim’s inability to drive off the grave-born attacker.

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To invade a host, the virus shell includes specific proteins that bind to receptors on the outside of red corpuscles. This is how the virus enters the blood stream. The virus is not airborne and cannot bind to air passages (as first thought). The act of binding draws the virus into the cell membrane. It then fuses and moves through it, emerging into the cytoplasm of the cell. Once there, the shell opens, releasing the ribonucleic acid.

The virus then travels quickly throughout the body, reaching all major organs, central nervous system and the brain. Once inside the cerebral cortex, the virus attacks the axons which connect neurons. The axons are surrounded by a fatty insulating sheath called myelin; this is used as an energy source for the virus. It 'feeds' on the myelin. This is what a growing number of scientists now believe tricks the brain to 'believe its body has actually died.' The body then goes through a protracted state of shock, followed by a slow and painful onset of mortification and necrosis. Death occurs within 4-48 hours. However, the brain is still alive. The virus in essence, 'tricks' the brain into killing its own body. But not letting the brain die. The virus feeds nutrients and stimulation to the surrounded brains myelin coating. Thus suspending atrophy of the body, and re-animating the host. The host then needs to gain additional nutrients to continue the feeding of the virus. And so it impulsively searches for food. The source of nutrition required by the virus, aphion A and betax B, is only found in warm blood and meat. Hence the cycle begins: The host needs to kill to serve the virus to keep the host alive. Studies are showing promising results. Antiviral test drugs can interrupt the process by which a virus reproduces at several stages. The inhibitor XL-6, for example, prevents the virus particle from opening after it enters the cell and can inhibit the manufacture of virus proteins. It stops the virus from exiting the cell. Although a lot of money, time and hope has been invested in this new drug, XL-6 is still a long way from being fully developed.

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