You’re on the bus or subway during your morning commute. A fellow passenger near you starts sneezing and coughing. You eye them suspiciously. Are you at risk for catching something?

Matthew A. Weissman, MD, MBA, of the Mount Sinai Health System offers some street-wise strategies for beating the cold and flu in New York City.

As New Yorkers, we ride subways, buses, and elevators—does that increase our risk or build immunity?

I think it does both those things. There’s data that says being exposed to a lot of germs over time increases your immunity to disease. So in general, people who live in New York are more immune to stuff than people who live by themselves on a farm somewhere.

We’re tough here in New York!

Absolutely. The problem is, there are lots of different types of colds and viruses. And the flu virus mutates and changes every year, so even if you have immunity built up, it doesn’t mean you’re not going to catch something. So yes, we’ve got tough exteriors and a tough immune system, but we’re still at risk of catching diseases.

Should people worry about riding crowded subways and buses? If one person coughs in a subway car, are we all going to get sick?

I don’t think so. A lot of fresh air gets into the subway. Doors open all the time. You’re not in an airtight capsule. You might want to give yourself as much space as possible. And if possible, you might want to alter your commute during cold and flu season to a time or a line that’s not as crowded. It’s also a great time of year to bundle up and walk part of the way to work or school. Enjoy the fresh air! But I ride the subway all the time.

What’s the best way to cover your cough?

People should cover their cough with their elbow, not their hands. Because if you cough into your hand, and then grab onto the subway pole that’s not helping anybody. And part of being a good New Yorker is helping each other by not riding the subway or going to work when you’re contagious, which can last 24 hours after your symptoms and fever go away. On the subway, I’m thinking about airborne germs and picking something up with your hands from the subway pole. So keep your hands away from your face while you’re on public transit, and when you get to work, it’s a good idea to wash your hands (and maybe even to carry some hand sanitizer with you).

Why is handwashing so important?

Handwashing is key. It’s one of the most important things you can do, other than get the flu shot. We come into contact with so many contaminated things in the city. And when you touch your face or rub your eyes, that’s a problem. Of course, you should wash your hands before you eat and after using the restroom. But after your commute, or any time you come into contact with dirty things is a good idea. Frequent handwashing throughout the day is smart. We don’t think about all the things we touch that are frequently handled, like computer keyboards, phones, door knobs, or office kitchen appliances like microwaves or refrigerators. When you go to the gym, you should wash your hands after using the treadmill or using weights. At the salad bar, no matter how clean, the utensils are used by a lot of people. In public restrooms, I try to always use paper towels to dry my hands instead of the air blowers, which tend to just spray germs around.

Use soap and warm water to wash your hands. Twenty seconds of scrubbing vigorously on all surfaces is key. Keeping Purell or another alcohol-based hand sanitizer is good, too. That would be convenient after your commute even though it doesn’t kill all kinds of germs.

Is wearing a mask on the subway effective against germs?

It may reduce your exposure but I think masks are actually more useful in preventing your own germs from spreading, since they’re not really air-tight around the sides. A lot of people don’t use them correctly and keep taking them off or reaching underneath with their hands. Is it worth the trouble? Maybe, but I’m not convinced that it’s as effective or useful as the other things we’ve talked about.

How about cabs and car services like Uber? How risky are they?

You’re probably better off in a cab or ride-sharing service than a subway in terms of avoiding germs. I try to keep the windows open as much as possible. And seatbelt buckles and door handles are more things that are frequently handled that we don’t think about. So minimize touching them and wash your hands after.

What about public restrooms? Are they safe during cold and flu season?

Sure, public restrooms are safe. I use them all the time. I think it’s very hard to get anything from a toilet seat, so laying down toilet paper or sanitary guards isn’t really that helpful. Hand dryers are another story. The evidence is that they just spray germs around. I’d much rather use paper towels, given a choice. And once you wash your hands, opening the door with a paper towel is a good idea.

What about salad bars?

While studies show that salad bars may have bacteria, it is not clear how often they actually cause disease. My suggestions are that you want to have a sense that the salad bar is well maintained. The cold food should be kept cold and the warm food kept warm. Is it being replenished regularly, or has it been sitting there for a long time? Does it have a sneeze guard on top? Of course, you can’t avoid using the serving utensils that lots of other people have touched. So especially during cold and flu season, I make sure that washing my hands is the last thing I do before I eat.

Any other advice for New Yorkers?

Living in New York is stressful, and that’s not good for your immune system. We’ve got emotional stress, we’re rushing, we’re busy, we don’t sleep enough—and all of it takes its toll on our immune system. And then you have our exposure to airborne pollutants. It’s always important to get exercise, to eat healthy including lots of fruits and vegetables, to sleep well at night, and to reduce stress as much as you can.

Matthew A. Weissman, MD, MBA, is Chair of the Department of Medicine at Mount Sinai Beth Israel and Senior Faculty in Internal Medicine and Pediatrics at Icahn School of Medicine at Mount Sinai

Last year’s flu season was one of the worst in recent memory.  The Centers for Disease Control and Prevention says a record number of people were hospitalized in 2017, which demonstrates why it’s so important to prepare for the flu each year.

Here are five simple tips from Joseph Feldman, MD, FACEP Mount Sinai Urgent Care Medical Director, to help protect you and your family this season:

• Get the flu vaccine

The vaccine is safe and does not the cause the flu. It’s often available with no copay or a low copay. The CDC recommends an annual flu shot for everyone age six months and older.

• Frequently wash your hands and use hand sanitizer

Pay special attention before eating  or after touching potentially contaminated surfaces like subway poles.

• Avoid people who sneeze or cough without covering their mouths and noses

This can be tough in crowded spaces, but do your best. And help protect others by sneezing and coughing into your elbow.

• If someone in your family gets sick, avoid close contact

Try to help your family member during their illness without getting too close and don’t share food or utensils.

• Get plenty of rest

When you’re tired, your immune system may be weakened, so get enough sleep to ensure your body is prepared to fight off germs.

Following these tips will give you a good chance at a flu-free winter. But if you do feel flu-like symptoms such as fever, cough, sore throat, runny nose, or body aches, visit your primary care physician or an urgent care center immediately so you can begin treatment, if necessary.