Solanum works by traveling through the bloodstream, from the initial point of entry to the brin. Through means not yet fully understood, the virus uses the cells of the frontal lobe for replication, destroying them in the process. During this period, all bodily functions cease. By stopping the heart, the infected subject is rendered "dead." The brain, however, remains alive but dormant, while the virus mutates its cells into a completely new organ. The most critical trait of this new organ is its independence from oxygen. By removing the need for this all-important resource, the undead brain can utilize, but is in no way dependent upon, the complex support mechanism of the human body. This organism is the zombie.