"Bacteria in bathrooms will come from feces, which can be aerosolized a bit when toilets, especially lidless toilets, are flushed", study author Peter Setlow told Newsweek.
Researchers in CT say using hand dryers can blow bacteria throughout bathroom surfaces and your hands. That bacteria then circulates in the air to then be sucked up, warmed up, and blown out of the dryer.
Unfortunately, a new study from the journal of Applied and Environmental Microbiology suggests that the hot-air hand dryer does just this.
Alternatively paper towels are found to be more hygienic, but that option is also less environmentally friendly and potentially more costly. Unlike other types of B. subtilis often found in soil, this strain is only found in laboratory environments.
Some hand dryers like those made by Dyson do use HEPA filters.
People use hand dryers for a plethora of reasons too - one of them might be because they enjoy the feeling of hot air on their wet hands.
Using a HEPA filter on the hand dryers reduced the bacteria by 75 percent, the study showed. Thus the air sprayed is teeming with bacteria like E. coli that is found in faeces. Convection created by a hand dryer's air streams, for example, might pull in unfiltered bathroom air.
The outcome of hand dryers spreading poo is unlikely to have a serious effect on your health, however, as many day-to-day items, such as mugs and desks, are also covered in germs.
The University of CT added paper towel dispensers to 36 of its bathrooms after completing the study, Newsweek reported.