Candida albicans

Etymology
Candida albicans:

candida: "white" (from latin candidus, meaning "white") (think: to speak "candidly" aka clearly)

albicans: "white" (from latin albicāns, meaning "white") (think: Albus Dumbledore, albinism, albumin, etc)

Explanation
Candida albicans is a polymorphic fungus, that is responsible for a number of infections, such as thrush, esophageal candidiasis, vaginitis, and skin/nail infections. Notably, when it coats the back of the throat during thrush infections, it can be seen to be white (hence it's name "white white").