For the study, they tested plastic, rubber, cloth, leather, and metal (gold and silver) wristbands to see if there is a correlation between wristband material and the prevalence of bacteria. They investigated the hygienic state of these various types of wristbands worn by active individuals and identified the best protocols to properly disinfect them().

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Using standard microbiological assays, researchers looked at bacterial counts, types of bacteria, and their distribution on the wristband surfaces. They also conducted a bacteria susceptibility assay study screening the effectiveness of three different disinfectant solutions: Lysol™ Disinfectant Spray; 70 percent ethanol, commonly used in hospitals and alcohol wipes; and a more natural solution, apple cider vinegar.

Here’s Why You Should Toss Common Wristbands

The results suggest that nearly all wristbands (95 percent) were contaminated. However, rubber and plastic wristbands had higher bacterial counts, while metal ones, especially gold, and silver, had little to no bacteria.

Plastic and rubber wristbands may provide a more appropriate environment for bacterial growth as porous and static surfaces tend to attract and be colonized by bacteria.

The most important predictor of wristband bacteria load was the texture of wristband material and activity (hygiene) of the subject at sampling time. There were no significant differences between males and females in the occurrence or distribution of the bacteria groups.

Bacteria found in the study were common skin residents of the genera Staphylococcus and Pseudomonas, and intestinal organisms of the genera Escherichia, specifically E. coli. Staphylococcus spp was prevalent on 85 percent of the wristbands; researchers found Pseudomonas spp on 30 percent of the wristbands; and they found E. coli bacteria on 60 percent of the wristbands, which most commonly begins infection through fecal-oral transmission.

The gym-goer showed the highest staphylococcal counts, which emphasizes the necessity of sanitizing wristbands after engaging in rigorous activity at the gym or home.

Staphylococcus aureus is a type of bacteria found on human skin, in the nose, armpit, groin, or other areas that cause a wide variety of clinical diseases. Pseudomonas spp., commonly in the environment, can cause infections in the blood, lungs (pneumonia), or other parts of the body after surgery. Enterobacteria are a large family of bacteria including many of the more familiar pathogens such as E. coli and Salmonella().

Even at relatively low numbers, these pathogens are of public health significance. Importantly, the ability of many of these bacteria to significantly affect the health of immunocompromised hosts indicates a special need for healthcare workers and others in hospital environments to regularly sanitize these surfaces.

Findings from the study showed that Lysol™ Disinfectant Spray and 70 percent ethanol were highly effective regardless of the wristband material with a 99.99 percent kill rate within 30 seconds. Apple cider vinegar was not as potent and required a full two-minute exposure to reduce bacterial counts.

While these common household disinfectants all proved at least somewhat effective on all materials (rubber, plastic, cloth, and metal), antibacterial efficacy was significantly increased at two minutes compared to thirty seconds.

Different disinfectants, depending on their active ingredients, kill bacteria in different ways, such as by disrupting cell membrane integrity, altering, or removing proteins, or interfering with metabolic activities.

Other potential forms of bacterial transmission and facilitation of infection, such as earbuds or cell phones, should be similarly studied in the future.

References:

1. Jeans, A R et al. Wristwatch use and hospital-acquired infection. The Journal of hospital infection vol. 74,1 (2010): 16-21.(https://www.journalofhospitalinfection.com/article/S0195-6701(09)00319-3/fulltext)
2. Tong, Steven Y C, et al. Staphylococcus aureus infections: epidemiology, pathophysiology, clinical manifestations, and management. Clinical microbiology reviews. 2015.( https://journals.asm.org/doi/10.1128/CMR.00134-14)
3. Tyan, Kevin et al. Considerations for the Selection and Use of Disinfectants Against SARS-CoV-2 in a Health Care Setting. Open forum infectious diseases vol. 7,9 ofaa396. 31 Aug. 2020.(https://academic.oup.com/ofid/article/7/9/ofaa396/5899802?login=false)

Source: Eurekalert