Consider a real-world host-parasite relationship such as the roundworm Baylisascaris schroederi which lives in the bowels of its host, the giant panda. We can anticipate why some people might be drawn ...

Drawn from the Italian mala aria ... or noxious exhalations from rotting matter or stagnant water. In 1889, a tiny parasite was revealed as the disease-causing agent, and eight years later ...