Mobile phones, now integral to daily life, are frequently carrying bacteria, with a recent experiment highlighting the potential for contamination, particularly after use in bathrooms. Research indicates that people in the UK spend an average of over three hours daily on their phones, and more than half of adults admit to taking them into the restroom. This habit, combined with infrequent cleaning—15% of Britons reportedly never clean their phones—creates a breeding ground for germs.
When a toilet is flushed, a plume of droplets containing bacteria and excrement can spread up to five feet in eight seconds, according to 2021 research from the University of Colorado Boulder. These droplets can land on various surfaces, including phones placed nearby. A 2020 review of 56 studies found that mobile phones commonly harbor bacteria such as E. coli or Salmonella, which can survive for a day or more and cause severe gastric symptoms if not properly managed through hand hygiene.
Further research from Bond University in Australia identified antibiotic-resistant superbugs on the phones of healthcare workers, underscoring the potential for serious infections. Public health and hygiene scientist Lisa Ackerley notes that "anything we touch becomes a transfer station for germs – and that includes our phones." She advocates for regular cleaning of mobile devices with antibacterial wipes as part of a routine hygiene practice.
To assess the extent of contamination, an experiment involved individuals swabbing their phones before and after using them in a bathroom environment, touching surfaces like door handles and toilet flushes. The swabs were then analyzed by Dr. Melody Greenwood, a consultant microbiologist. The analysis measured bacterial load in colony-forming units (CFUs), with a freshly bleached kitchen surface ideally showing a count of ten or fewer.
One participant, Patricia Porter, 55, saw her phone's bacteria count double from 1,100 CFU to 2,300 CFU after a bathroom visit. Her phone carried Staphylococci, a group of bacteria commonly found on skin, some strains of which can cause infections in vulnerable individuals. She also had Pediococci, linked to plants and the environment, potentially transferred from her pets.
Antonia Hristov, 31, had a relatively low count, with her phone's bacteria doubling from 540 CFU to 1,000 CFU. Her phone contained Micrococcus, a bacterium found in soil, water, dust, and air, which can cause infections in rare cases, particularly in those with weakened immune systems.
Jonathan Royle, 50, experienced a significant increase, with his phone's bacteria count rising from 2,700 CFU to 12,000 CFU. The bacteria identified were mainly Micrococci and Staphylococci. Royle, who frequently travels and uses his phone in various public places, acknowledged that regular cleaning was not a priority but planned to change his habits.
Law student Malik Fraz Ahmad, 22, showed the most dramatic increase, with his phone's bacterial count escalating from 14,000 CFU to 910,000 CFU. This surge was attributed to potential contamination from bathroom surfaces like taps and the toilet flush. His sample also contained Enterobacteriaceae, a group that includes pathogens like Salmonella, raising concerns about the potential for illness.
Nicola Jenkins, 39, an entrepreneur, had an unusual result where her phone's bacterial count decreased from 10,000 CFU to 2,300 CFU. However, the post-bathroom swab revealed new bacteria: Micrococci and Bacillus. While Bacillus is typically harmless, certain types can cause food poisoning if toxins are produced in food left at room temperature. The initial high count on Jenkins' phone, despite the decrease, highlighted how bacteria can accumulate on everyday objects.
Experts recommend cleaning phones with a microfibre cloth and a phone-safe disinfectant wipe, such as one with 70% alcohol. They also advise against using phones in germ-prone areas like bathrooms and kitchens during food preparation, and on public surfaces. Cleaning phone cases and accessories regularly, avoiding phone sharing, and not placing phones on dirty surfaces are also key preventive measures.