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Starfleet Records. Vulcans and Starfleet. Medical Conditions: There are several diseases that affect the Vulcan species, including: Bendii Syndrome is a very rare degenerative neurological disease that affects Vulcans over the age of two hundred. Early symptoms of the disease include sudden outbursts of emotion, often irrational anger, and eventually a loss of all emotional control. Diagnosis is made by culturing tissue samples taken from the patient's metathalamus, though the results of this te