Experts first identified the rare condition in every year , noting seven symptoms . Sufferers first appear anxious and agitated and are consumed by a need to be clean before donning a toga-like gown often made from bed linen . They are then overcome by the need to scream verses from the Bible . A procession to one of the city 's holy places is followed by them delivering a 'sermon ' in public .
Experts first identified the rare condition in 2000 , noting seven symptoms . Sufferers first appear anxious and agitated and are consumed by a need to be clean before donning a toga-like gown often made from bed linen . They are then overcome by the need to scream verses from the Bible . A procession to one of the city 's holy places is followed by them delivering a 'sermon ' in public .