Part horror movie, part medical detective story, find out what happens when people fall prey to an infection from a parasite, those nasty microscopic creatures found in water, soil and even in the air. Victims' stories are retold, including how doctors and scientists attempt to unravel each case before it's too late. Biologist Dan Riskin, assisted by doctors and experts who witnessed each case, leads the scientific discussion about each parasite.
6 episodes
2009
10 episodes
2010
10 episodes
2012
10 episodes
2013
10 episodes
2014
10 episodes
2015
7 episodes
2016
13 episodes
2017