Name of Disease: Doppelganger Syndrome
Scientific Name: Xeno-Contagium Centauri
Discovered when: 3521
Symptoms:
Stage I: Dizziness, headaches, gradually worsening sensitivity to stimuli such as light and sound, paranoia and a tingling or crawling sensation under the skin, primarily of the scalp and face.
Stage II: Irritability, mood swings, increased paranoia, migraines, gradual loss of hearing and sight, insomnia, loss of appetite, hallucinations (typically exacerbated by the lack of nutrients and sleep). At this stage, the infected patient's eyes form temporary cataracts; in about half of the documented cases, this is also the point where the signature filament-like structures in the eye begin to form.
Stage III: Sudden decrease in speech, movement and response to stimuli. Patient's eyes seal shut, unable to be opened unless surgery is performed. Eventually, a coma-like state falls over the patient. Heart rate and breathing slow, and body mass rapidly decreases. Any efforts to introduce liquids, nutrients or oxygen are rejected by the body. This is commonly known as the incubation stage.
Stage IV: After roughly three months, the patient wakens. They move in a mechanical manner, ignoring any and all stimuli until the eyes open, revealing the full infestation. Over a few days, the fully infected patient seems to"experiment", testing their dexterity, strength, facial expressions and vocal capabilities. This typically leads to mimicry of any people withing their range of sight or hearing. Attempts to contain the infected become increasingly difficult, as they move from a slow, docile demeanor to an moderately aggressive one as they attempt to escape. Should they manage to do so, they seek out the most densely populated area near their point of origin. Once there, they attempt to blend in with uninfected humans, returning to a docile nature. Despite this, at this stage they can be considered dangerous, as they display higher brain function; they are known to steal, lie and effectively evade any search forces. If not detained, they will expire within a year, the corpse then releasing thousands of Xeno-Contagium Centurai bacteria into the surrounding area.
Deadly or Treatable: Treatable within the first two stages.
Treatment if any: If caught early, radiation can be used to slow the spread of the infection. Surgery of the brain and eyes can remove the clusters of infectious material. Further treatment of radiation can eliminate any regrowth.
Where did it originate? The Alpha Centauri system. Men and women traveling from this system were the first to exhibit symptoms.
Who does it effect most: Adult men and women. Twenty to thirty is the prime age, however rare cases of children and older adults have been documented. Animals in close proximity to humans are known to become infected.
What can get it (animals, humans, etc): Mammals