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Zombification Bacteria

The bacterium that causes zombies is not related to any known phylum of bacteria. Due to its unique genetic structure and protein composition, it is believed that the virus is of extraterrestrial origin; brought to Earth by either a comet or meteor. The zombie bacteria reanimates dead tissue by binding to the mitochondria within infected cells, and then beginning a process of photosynthesis in which they absorb a wide spectrum of light encompassing both violet and ultraviolet wavelengths. The resultant biochemical energy produced from this process is able to adequately power the motor neurons and lower brain functions. As the body becomes self-sufficient on this energy, the respiratory and circulatory systems become vestigial, ending the body's dependence on oxygen. In the process, all higher brain functions are destroyed. This leaves only the cerebrum to govern behavior. That in turn creates very animalistic behavior. Necrosis of the hypothalamus produces a massive flood of neurotransmitters, enzymes, and hormones such as norepinephrine and dopamine. These effects, combined with the painful symptoms of body-wide tissue decay, induce a psychotic rage and persistent hunger. Although the cognitive functions of zombies are almost non-existent, their residual natural human instincts causes them to disregard cold putrid flesh as a food source. Likewise, they are instinctively attracted to warm healthy flesh. An augmented sense of smell caused by a neuronal protein cascade enables them to easily distinguish the two. As a result, zombies do not attack each other. Massive trauma to the brain is the most effective method of killing a zombie.