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Home Science & Environment

What Lives Between Your Toes? A Microbiologist Explains. : ScienceAlert todayheadline

August 10, 2025
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Your feet are microbial hotspots. The area between your toes is packed with sweat glands, and when we wrap our feet in socks and shoes, we trap that moisture in a warm, humid cocoon that’s ideal for microbial growth.

In fact, your feet may be home to a miniature rainforest of bacteria and fungi, with anywhere from 100 to 10 million microbial cells per square centimeter of skin surface.

Not only do feet host a huge variety of microorganisms – up to 1,000 different species per person – but they also have a wider range of fungal species than any other part of the body. That means your feet aren’t just sweaty or smelly – they’re genuinely biodiverse.

Related: Woman’s Mysterious Burning Feet Traced to Worms in Her Brain

Because your feet are microbe-rich, your socks become prime real estate for these same bacteria and fungi. Studies show that socks harbor both harmless skin residents, like coagulase-negative staphylococci, and potentially dangerous pathogens, including Aspergillus, Staphylococcus, Candida, Histoplasma and Cryptococcus.

These microbes thrive in the warm, moist spaces between your toes, feeding on sweat and dead skin cells.

Their byproducts, such as volatile fatty acids and sulphur compounds, are what give sweaty feet, socks and shoes that notorious odor. It’s not the sweat itself that smells, but the microbial metabolism of that sweat. Perhaps unsurprisingly, smelly feet are so common the NHS has dedicated pages of advice on the issue.

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The sock microbiome isn’t just influenced by your feet – it also reflects your environment. Socks pick up microbes from every surface you walk on, including household floors, gym mats, locker rooms and even your garden.

They act as microbial sponges, collecting bacteria and fungi from soil, water, pet hair and dander, and the general dust of everyday life. In one study, socks worn for just 12 hours had the highest bacterial and fungal counts of any clothing item tested.

And those microbes don’t stay put. Anything living in your socks can transfer to your shoes, your floors, your bedding – and even your skin.

In a hospital study, slipper socks worn by patients were found to carry floor microbes, including antibiotic-resistant pathogens, into hospital beds. It’s a reminder that foot hygiene isn’t just a personal issue – it can have broader implications for infection control and public health.

Super-spreaders

Socks can also play a key role in spreading fungal infections like Tinea pedis (better known as athlete’s foot), a highly contagious condition that primarily affects the toes but can spread to the heels, hands, or even the groin. The infection is caused by dermatophyte fungi, which love warm, damp environments – exactly the kind you find in sweaty socks and tight shoes.

To prevent this, experts recommend avoiding walking barefoot in shared spaces like gyms and pools, not sharing socks, towels, or shoes, and practicing good foot hygiene, which includes washing and drying thoroughly between the toes. Topical antifungal treatments are usually effective, but prevention is key.

It’s also important to note that socks can retain fungal spores even after washing. So if you’ve had athlete’s foot, wearing the same pair again – even if it looks clean – could trigger reinfection.

The safest approach is to wear fresh socks daily and allow your shoes to dry out completely between wears. Choose breathable fabrics and avoid footwear that traps heat or causes excessive sweating.

How to wash your socks properly

Most laundry advice focuses on preserving fabric, color and shape – but when it comes to socks, hygiene matters more. Studies show that washing at typical domestic temperatures (30–40°C) may not be sufficient to kill bacteria and fungi.

In fact, under-cleaned socks can act as infection vectors, especially in households with vulnerable people.

To properly sanitize your socks:

  • turn them inside out before washing to expose the inner surface where most microbes accumulate
  • use an enzyme-based detergent, which helps break down sweat and skin debris
  • wash at 60°C when possible, as the higher temperature helps detach and kill microbes
  • steam iron your socks if you need to wash at lower temperatures – heat from ironing can destroy residual spores.

Cotton socks tend to tolerate higher temperatures better than synthetic blends, making them a better option for those prone to fungal infections. Drying socks in direct sunlight can also help: UV light has known antimicrobial effects.

The forensic power of sock microbiomes

Your socks might say more about you than you realize. In a US murder investigation, forensic scientists used soil bacteria found on a suspect’s socks to link them to the burial site of a victim.

The microbial profile of the socks closely matched that of the crime scene – suggesting the socks had picked up and preserved location-specific soil microbes. This emerging field of forensic microbiology shows how microbial signatures can offer valuable clues in legal contexts.

It’s a reminder that the ecosystems we carry on our bodies – and in our clothing – are not only complex and revealing but also surprisingly durable. Whether it’s helping to solve crimes or fueling a fungal outbreak, your socks are far more biologically active than they appear.

So next time you peel off a sweaty pair at the end of the day, spare a thought for the microscopic universe you’ve been walking around in. And maybe, just maybe, opt for that 60-degree wash.The Conversation

Primrose Freestone, Senior Lecturer in Clinical Microbiology, University of Leicester

This article is republished from The Conversation under a Creative Commons license. Read the original article.

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