The above video is pretty cute, and a reasonably good introduction to control of microbial growth.

The above video provides a fairly brief, wonderfully presented story of Ignz Semmelweis, Joseph Lister, and the origins of antiseptic surgery (which basically is the use of aseptic technique, antiseptics, and disinfectants in association with surgical practice).

The above video considers bacteriophage-mediated removal of pathogenic bacteria from foods.