A relatively straightforward classroom experiment this may be, but the fascinating (and beautiful) images produced by students at the University of Surrey when they imprinted their smartphone onto a bacterial growth medium will inevitably give owners of similar devices pause for thought.
Though identifying bacteria by appearance can be difficult…the University of Surrey’s Dr. Simon Park, who teaches course BMS1035, Practical and Biomedical Bacteriology, tells Gizmag that most of the bacteria seen, which have been grown in Plate Count Agar…for three days, are harmless and typically found on human skin, such as those in the genus Micrococcus.
The exercise does occasionally show the presence of disease-causing bacterial pathogens such as Staphylococcus aureus, associated with a number of infectious diseases of varying severity. Dr. Park tells Gizmag that this isn’t surprising considering that 20 percent of people are persistent carriers, and 60 percent intermittent carriers, of this species of bacteria. “The ecological niche on the body for Staphylococcus aureus is the nostrils,” Dr. Park said. “So a furtive pick of the nose, and quick text after, and you end up with this pathogen on your smartphone…”