There Are More Bacterial Cells on Your Phone Than on a Toilet Seat

While we often view public toilet seats as the ultimate symbol of germ-infested surfaces, the truth is they are often far cleaner than the device in your pocket. Toilet seats are typically made of smooth, non-porous materials that are difficult for bacteria to cling to, and they are cleaned with harsh disinfectants relatively frequently. Furthermore, they are generally cool and dry, making them inhospitable environments for microbial life to truly flourish. This combination of factors keeps their bacterial load surprisingly low.

In stark contrast, your smartphone is a perfect incubator. The heat generated by the battery creates a warm, cozy environment, while the constant contact with your hands and face provides a steady supply of moisture, skin oils, and nutrients for bacteria to feed on. Scientists refer to objects that can carry infectious agents as "fomites," and our phones are among the most personal and persistent fomites we own. We take them everywhere, from the kitchen to the bathroom, rarely cleaning them as thoroughly or as often as we wash our hands.

The good news is that the vast majority of this bustling microbial community consists of our own skin flora, which is generally harmless. However, because our hands touch countless other surfaces throughout the day, phones can and do pick up more problematic pathogens like Staphylococcus or E. coli. This makes the humble smartphone a significant, though often overlooked, vector for transferring germs directly to our hands, face, and mouth.