The Unpleasant Truth About Communal Yoga Mats

After one too many classes that started with a mat still dripping with sweat from whoever used it last, we couldn't help but wonder what might be living on it.
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Risk #1: Athlete's Foot
What the experts say: "Fungus is the number one issue when it comes to what you could catch from a yoga mat," says Jane Andersen, DPM, board-certified foot surgeon in Chapel Hill, North Carolina.

What you should know: It's not that tough to clear it up when it's on your skin, but it becomes a whole lot harder to treat if it makes its way to your toenails. (Topical treatments usually take at least four months to work, since you need to wait for a new, healthy nail to grow in.)

Risk #2: Staph Infections
What the experts say: "Bacteria that cause these types of infections love moist, humid, warm environments, so hot yoga studios are the worst," says Marie Jhin, MD, a board-certified dermatologist in San Francisco. "They'll live on the mat for weeks if it doesn't get disinfected."

What you should know: Catching staph is unlikely, says Andersen, who's never seen a serious bacterial infection that could be traced to a yoga mat. A study in the American Journal of Infection Control found no sign of MRSA (a drug-resistant form of staph) on equipment or floor mats at three gyms tested for traces. And though being immune-compromised puts you at a slightly higher risk if you do come in contact with the bug, the average person's immune system is generally strong enough to fight off these infections.

Risk #3: Warts
What the experts say: The virus that leads to warts also thrives in moist, sweaty places, says Andersen.

What you should know: There's (borderline) good news: Even if you're doing floor work during class and your torso or thigh comes in contact with a virus on your mat, you're unlikely to start sprouting warts there. "Warts are usually specific to the bottom of the foot," says Andersen, and the same goes for fungus -- precisely because those areas provide an environment where bacteria can thrive.

Risk #4: A Nasty Case of Diarrhea
What the experts say: Catching something like this is rare, but bacteria that can make your stomach beg for mercy could get tracked into the studio via a fellow yogi's shoes, says Jhin.

What you should know: A small 2014 study found that shoe bottoms were even more likely to carry clostridium difficile (a diarrhea-inducing bacteria that the CDC has classified as an urgent threat for antibiotic resistance) than bathroom surfaces, with 39.7 percent of sneaks testing positive for it. The odds that you'll use a mat that touched a contaminated spot on the floor, then forget to wash your hands before you eat (one way you could get the bacteria inside your body) are very low, but if you want to be extra safe, consider avoiding studios that allow shoes in the room where you get your downward dog on. In another study (funded by a footwear company and conducted by a researcher at the University of Arizona), 27 percent of sneaker bottoms contained E. coli, which can also cause diarrhea, abdominal cramping and vomiting.

How to Avoid These Problems
If you can't bring your own mat, a few simple steps can help make sure you don't catch something during your next class.

- Wear yoga socks (which typically have a rubbery material on the bottom to grip the mat so you don't slip) to protect your feet.
- Keep hands and feet well moisturized. Infections, fungus and viruses make their way into your body through cracks both big and small, says Jhin, so those with very dry skin are more susceptible.
- Ask the studio how they clean their mats. Alcohol-based or other antibacterial cleaners are best, and make sure they let their mats dry completely before they roll them back up, says Andersen. "That damp environment is where these organisms like to live, so if you spray the mat down and it's still moist when you roll it up, the moisture issue could just get worse."

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Kitchen Sink(01 of09)
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Even though it comes in contact with hot water and soap multiple times daily, your kitchen sink is probably crawling with bacteria -- perhaps even more than you'd find on the toilets of public bathrooms, which may be regularly scrubbed with powerful disinfectants. A recent study by NSF International, a nonprofit organization that develops public health standards, found that because of the frequent contact they have with food, kitchen sinks are 100,000 times more contaminated than bathroom sinks. Scrub the entire surface of yours down once or twice a week with hot water and soap, making sure to remove every trace of coffee grinds, scrambled eggs or whatever else you see. (credit:Thinkstock)
Coffee Maker(02 of09)
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Washing the inside of this workhorse every 40 to 80 brews won't just make your coffee taste better -- it'll also eliminate the bacteria and mold that NSF says tends to grow there because of the dark, damp environment. Fill the tank (or reservoir, as it's called on some models) with about four cups of vinegar and let it stand for 30 minutes. Run a cycle with the vinegar, followed by two or three cycles with water until the vinegar smell fades. (credit:Thinkstock)
Stove(03 of09)
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If we had to guess, we'd put the refrigerator door handle or microwave keypad ahead of stove dials when it comes to dirt level -- but the controls that adjust your range's heat are some of the filthiest places in your home, since you often touch them when your hands are contaminated with food, and they're harder than the fridge door handle or microwave buttons to wipe clean, according to the NSF study. Check your stove's owner's manual for cleaning instructions; you may be able to put the dials in the dishwasher (if not, wash in warm soapy water, rinse well and dry before replacing). (credit:Thinkstock)
Toothbrush Holder(04 of09)
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This benign-seeming bathroom cup is one of the germiest spots in the house: the average holder is crawling with more than 2 million cells of bacteria. Bamboo and wood may look attractive, but they're difficult to clean, so go with a dishwasher-safe material like brushed stainless steel, or plastic, and clean it once or twice a week. (credit:Thinkstock)
Carpets(05 of09)
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The average vacuum cleaner's suction and rotating-beater brush don't usually reach the bottom of the carpet, and that area is a haven for bacteria -- about 200,000 per square inch, according to research conducted by Philip Tierno, Jr., PhD, a microbiologist and immunologist at New York University Langone Medical Center. In his book, The Secret Life of Germs, Tierno explains that hundreds of thousands of different types of species feast on human skin cells that fall onto rugs, plus tiny pieces of food, pollen and pet dander. Most carpet manufacturers say the best way to deep clean is to use steam, aka hot-water extraction, every 18 months. (credit:Thinkstock)
Kitchen Counter(06 of09)
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This is one of the most high-traffic surfaces in people's homes, say the experts at NSF, with everything from purses to bags of groceries to packages of raw chicken leaving behind all types of germs. After cooking or preparing food, and at the end of every day, wash the surface with hot, soapy water, then rinse. (Casabella's new sponge/squeegee lets you easily soap up counters, rinse and swipe water off.) (credit:Thinkstock)
Pet Food Dish(07 of09)
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Although most dogs eat twice a day, you don't have to wash the container after every meal -- once a day is sufficient. Run it through the dishwasher or scrub it by hand with hot water and soap. VetStreet.com recommends stainless steel or heavy plastic "crock-style" bowls, since they hold up best through frequent cleanings. (credit:Thinkstock)
Kitchen Sponge(08 of09)
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We've heard these scrubbers can be a breeding ground for bacteria -- and the NSF study confirms that it's not only possible but likely that the one near your sink contains E. coli and salmonella bacteria. NSF found that after three weeks of use, 70 percent of sponges started exhibiting bacteria -- but germophobes shouldn't wait that long to clean or replace theirs. A two-minute turn in the microwave can kill most of the viruses, parasites and spores that grow on sponges, and the organization recommends changing to a new one every two weeks or less. (credit:Thinkstock)
Bathtub And Shower(09 of09)
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Over the course of its research in American homes, NSF found that 26 percent of bathtubs and showers harbored the bacteria known as staphylococci, which can cause problems from superficial skin lesions to urinary tract infections. You can keep these germs at bay by using a mild shower spray daily ( just avoid abrasive cleaners).Next: Cleaning secrets from a top real estate broker (credit:Thinkstock)

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