Microbiologist Jason Tetro, a visiting scientist at the University of Guelph, is featured in a Dec. 4  NBC News.com story about the science of cleaning.

Tetro is the author of  two books, The Germ Files and The Germ Code, and is known as “the germ guy.”

In the article, Tetro, a U of G graduate, discusses how often people should perform household cleaning tasks such as changing bedsheets and cleaning the bathroom.