[Name] Atma Virus [Source] Digital Devil Saga [Symptoms] 
A mystical, noncommunicable virus which marks its carriers with a tattoo-like mark somewhere on their bodies. Carriers are immune to Cuvier Syndrome can transform into a demonic reflection of their inner personalities, referred to as Atma. However, everyone with the virus feels an insatiable hunger for the flesh of other carriers. If this hunger is resisted for too long, the carrier will eventually enter an irreversible state of mindless bloodlust, losing the ability to return to human form.