This is an intriguing concept that I believe people will find interesting, so I would suggest that teachers could use it as a current event article.
Bacterial "Signatures" Linger on Users' Keyboards
recent research into the human microbiome –
suggests that humans serve as hosts for an astounding diversity of microorganisms. In fact, each of us supports as many as 10 times the number of microbes as there are cells in the human body.