The Enterprise is conducting a planetary survey of Surata IV, a planet which has never been visited by the Starfleet before.
	Pulaski claims the micro-organism which invades Riker's nervous system has elements of a bacteria and a virus but falls into neither category.
	The micro-organism enters Riker's body through a moving vine which apparently seeks out warm-blooded beings, but is sensitive to brain endorphins.
	Riker claims his grandfather was once bitten by a rattlesnake but after three days of intense pain, the snake died.
	Pulaski uses tricordrazine to treat Riker.

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