Mobile phones are 'Trojan horses' for germs. Here's how to clean them

A recent study has revealed that mobile phones function as "Trojan horses" for germs, harboring a vast array of microorganisms that could pose health risks, particularly to vulnerable individuals. According to Lotti Tajouri, an associate professor in molecular biology and genomics at Bond University and Murdoch University, over 17,000 microorganisms, ranging from bacteria and viruses to fungi and parasites, were identified on 95 mobile phones analyzed during his research. The findings highlight the potential danger of smartphones as high-touch surfaces that accumulate pathogens through frequent human contact. Tajouri’s research underscores the alarming habit of using mobile phones in public restrooms, with 80 percent of participants admitting to this practice. This behavior contributes significantly to the proliferation of germs on devices, creating ideal conditions for microbial growth due to the warmth and moisture retained by phones. He describes phones as “biological magnets,” offering a “five-star hotel” environment for microorganisms. These germs can be transferred back to users via face contact, with an average of 25 touches to the face per hour, increasing the risk of infection transmission. The presence of superbugs and antibiotic-resistant genes on smartphones further complicates the issue. Tajouri notes that such microorganisms thrive on phones because they provide the necessary conditions for breeding. Additionally, the act of speaking into phones introduces droplets of saliva, contributing to the spread of pathogens. Immunocompromised individuals, including children, the elderly, and those with chronic illnesses like diabetes, are especially susceptible to illness from contaminated phones. Meena Jha, head of technology at Central Queensland University, emphasizes that while germs on phones don’t automatically lead to sickness, maintaining good hygiene practices is crucial. She points out that smartphones are frequently touched surfaces capable of catching microbes, necessitating regular cleaning. Despite this, research indicates that most people neglect to clean their devices regularly. A survey among hospital staff in Queensland found that 52 percent used their phones in public toilets, and 57 percent claimed they never cleaned their devices. To effectively clean a phone without causing damage, Jha advises unplugging the device if it is charging and removing any protective cases or accessories. For initial cleaning, a soft microfiber cloth is recommended. If disinfection is required, she suggests using isopropyl alcohol wipes with no more than 70 percent concentration, aligning with manufacturer guidelines. It is essential to apply the solution gently and avoid spraying liquid directly onto the phone. Cloths or wipes should be slightly damp rather than soaking wet to prevent moisture from entering charging ports or speakers. For hard-to-reach areas, a soft, dry brush can be used instead. Strong cleaning agents like vinegar, bleach, and hydrogen peroxide should be avoided, as they can harm the oleophobic layer on smartphones, which resists fingerprints and smudges. Excessive scrubbing and harsh chemicals can degrade this layer, reducing the phone’s touch responsiveness over time. Jha recommends cleaning phones weekly, though the frequency may vary depending on usage and environmental factors.