The second is a matter of professional dignity. "It's almost like a gardener with dead plants," says Griffin, chief of the division of infectious disease at Island Infectious Disease Medical in Long Island, N.Y. and president of Parasites Without Borders. "I really don't want to be sick—because then the infectious disease doctor got sick.”
We asked six infectious disease experts which habits they never skip.
Her favorite solution: color-coded cutting boards. Meat always goes on the red one; vegetables never do. "If your meat is always on the red cutting board, you're never gonna have your salad stuff on your red cutting board,” she says.
Wash your produce under running water—not in a bowl
Some people think rinsing produce means filling a bowl with water and letting everything soak. But that's not the best approach. "What you actually need is that little bit of friction to break the surface," says Dr. Heidi Torres, an infectious disease physician and assistant professor of clinical medicine at Weill Cornell Medical College. About 30 seconds under running water, while gently rubbing the produce with your hands, does far more than a passive soak.
A sponge is a nearly perfect habitat for germs: damp, warm, and studded with food particles, sitting next to the counter where you just set down raw chicken. "Sponges and wet dishcloths are really good at growing bacteria," says Kelley Steury, a clinical associate professor in the school of public health at the University of Nevada, Reno, who specializes in veterinary preventive medicine. Her routine: Rinse her sponge until no food particles come out, then microwave it for 20 seconds. Just make sure it's wet. "If you did it when it was pretty dry, you could start a fire,” she says.
Brush your teeth like it's infection control
"At least 25% of infections that I see are related to dental disease," she says. Here's why: Every day, small amounts of bacteria slip into your bloodstream, and a healthy immune system clears them without you ever noticing. Cavities and gum disease change the equation. They allow more bacteria—and more aggressive bacteria—to leak into the blood, which Torres describes as "a highway to all your organs." In some cases, she says, doctors can trace an infection back to the mouth because the bacteria involved simply don't live anywhere else.
Your bath mat outside the tub should be washable, hung to dry between uses, and tossed in the laundry about once a week. "We don't leave the wet stuff on the floor, because that's gross," Roberts says. A damp bath mat can also spread athlete's foot from one person to another.
Leave your shoes at the door
Shoes pick up a lot more than dirt. Every sidewalk has been shared with other people, their pets, and whatever else has passed through. Dr. Cesar J. Figueroa Ortiz, an infectious diseases specialist at Memorial Sloan Kettering Cancer Center in New York, would rather not track any of that across the floors where his family walks and spends time—so shoes come off at the door.
Before guests arrive, most people wipe down the counters. Chin-Hong thinks they should be paying more attention to the air. "I respect air more than surfaces," he says. "You're probably going to have a bigger bang for your buck when you think about ventilation."
Wash your hands like you're not in a hurry
Even infectious disease doctors don't always practice perfect hand hygiene. Griffin has watched colleagues race out of a public restroom because they were about to miss a lecture at a conference. "They're so anxious to get back out because they're missing whatever the lecture is, and they're not really doing proper hand hygiene," he says. "Even the people that should know better are rushing back out."
His other rule is knowing when soap and water beat sanitizer. (Basically always.) Alcohol-based hand sanitizer doesn't kill everything: Norovirus—the highly contagious stomach bug behind many cruise ship outbreaks—is particularly resistant. Soap and water keep you safe, though, so if someone around you is vomiting or has diarrhea, Griffin says, head for the sink.
She's selective about when she does it. What worries her are high-touch surfaces that are indoors and out of the sun: elevator buttons, soda fountain dispensers, and the door handle to a medical clinic, for instance. And if she does touch one of those surfaces directly, she waits until she can wash her hands before touching her eyes, nose, or mouth.
Decline the grocery-store sample
"I always think about what happened to the grocery cart before you got there," Roberts says. "Somebody picked up raw chicken. Somebody picked up raw seafood. And all of that is on the cart. It's on the handle."
At the gym, Torres worries less about the person coughing on the treadmill than the surfaces her bare skin touches. Benches, mats, and other shared equipment can harbor MRSA and fungi like ringworm—even at the nicest gyms. She wipes equipment down before using it, not just afterward, and if there aren't disinfecting wipes available, she puts a towel between herself and the bench.
Wash any cuts before reaching for the antiseptic
Most of us instinctively reach for the antiseptic after nicking a finger. Chin-Hong heads for the sink instead. "The more important thing is to rinse it well with running water and soap, which is more important than the aggressive disinfectant," he says. Disinfectants don't kill everything, but running water can physically flush away germs before they have a chance to cause trouble.
Torres never leaves for a weekend in tick country without packing a pair of tweezers. It might sound excessive, she admits, but after years of treating tickborne illnesses, it's become second nature. "This is a little unusual—maybe my colleagues don't do this," she says, "but whenever I go away for a weekend, I always pack a pair of tweezers."
It matters more than you might think. "Most people that develop Lyme disease or tickborne illness have no recollection of ever being bitten by a tick or ever seeing a tick," Torres says. She's also vigilant against ticks to try to prevent alpha-gal syndrome—the tick-triggered allergy to red meat that has become increasingly common.
Reapply bug spray like it's sunscreen
The biggest mistake people make, he says, is treating bug spray like a one-and-done product. "It's like sunscreen. You don't get away with just applying it once." If you're outdoors all day, reapply at least every six hours. He also recommends choosing a repellent with about 20% to 50% DEET—or 20% picaridin if you prefer to avoid DEET—and remembering that the mosquitoes most likely to spread disease are busiest from dusk to dawn.
Rinse your toothbrush with bottled water when traveling abroad
He calls what often follows "third-day sickness." By then, your toothbrush has been rinsed repeatedly in tap water and left to sit in a warm, humid bathroom—giving any lingering microbes plenty of time to multiply before the brush goes right back into your mouth. His solution takes just a few seconds: rinse your mouth and toothbrush with bottled water, too.
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