"So, naturalists observe, a flea has smaller fleas that on him prey; and these have smaller still to bite ’em; and so proceed ad infinitum."
- Jonathan Swift
January 10, 2010
January 8 - Giardia muris
A cousin to the parasites that cause the disease sometimes affectionately referred to as "beaver fever" in humans, is Giardia muris. Unlike the parasite that plagues people, this species cannot infect humans, but rather only mice and other rodents. It has thus been developed as a laboratory model for studying the parasite of humans. These parasites and their relatives, the diplomonads are also cool in that they have two nuclei.
Image from the CDC Public Health Image Library.