How long does flu last on surfaces

Even if you’re not usually a germaphobe, cold and flu season can have the strongest-willed of us feeling squeamish about touching things like bus and subway poles, doorknobs, and even shaking a stranger’s hand. As many moms like to remind their kids: You don’t know where that hand has been. And during the colder months, when it seems that everyone is sniffling and sneezing, a hands-off policy may seem smart.

But how likely is it really that you’d get sick from touching an infected handrail or countertop?

Pretty likely, Alison Carey, MD, an associate professor of microbiology and immunology at Drexel University, tells Health. “Flu viruses can survive on hard surfaces (like bus poles) and infect another person for 24 to 48 hours,” she says. “Cold viruses don’t survive as long—usually a few hours. But there is evidence that they can survive and be passed on for up to 24 hours.”

So yes, it’s entirely possible that someone who has a cold or the flu can sneeze into their hand, then touch a doorknob or bus pole, and anyone who opens the same door or grabs the same pole for the next few hours (and up to a whole day) can catch their illness. The longer the virus sits, the more the possibility of someone catching the cold or flu decreases, Dr. Carey says. “But people can definitely get it from touching bus poles, especially in the five to 10 minutes that elapse from a sick person getting off the bus and someone else getting on,” she says.

Any surface can harbor a cold or flu virus long enough for someone to touch it and get sick, Dr. Carey says, but there are certain germy hotspots like bus and subway poles and doorknobs. Basically, it’s worth being wary of any surface that gets touched again and again during the day, such as: handrails, doors, light switches, faucets, and public transportation poles. “If you’re going through a subway turnstile, that gets touched and touched and touched,” Dr. Carey says.

So how can you protect yourself, short of wearing latex gloves everywhere you go? It comes down to good hand hygiene and proper sneezing etiquette, Dr. Carey says. “Just wash your hands! And keep them away from your face as much as possible."

People touch their faces all the time without realizing it, she adds, and that’s an easy way to take a cold virus from the doorknob right into your body. “It’s not that difficult to pass along the viruses,” Dr. Carey says. “That’s why everyone gets sick this time of year.” If you’ve touched an infected surface and then bring your hand up to cover a yawn or rub your eye or scratch your nose, then you’re introducing that virus to a vulnerable spot on your body, and it’s sure as heck going to take advantage.

Keep those hands clean (alcohol-based hand sanitizer can do the trick when a sink isn't available) and away from your face—and sneeze into a tissue or into the crook of your elbow if you’re already sick. Other than getting the flu shot, it's one of the best ways to keep the virus from spreading.

Flu (influenza) is a common infectious viral illness spread by coughs and sneezes. It can be very unpleasant, but you'll usually begin to feel better within about a week.

You can catch flu all year round, but it's especially common in winter, which is why it's also known as seasonal flu.

Flu isn't the same as the common cold. Flu is caused by a different group of viruses and the symptoms tend to start more suddenly, be more severe and last longer.

Flu symptoms

Some of the main symptoms of flu include:

• a high temperature (fever) of 38C (100.4F) or above
• tiredness and weakness
• a headache
• general aches and pains
• a dry, chesty cough

Cold-like symptoms, such as a blocked or runny nose, sneezing, and a sore throat, can also be caused by flu, but they tend to be less severe than the other symptoms you have.

Flu can make you feel so exhausted and unwell that you have to stay in bed and rest until you feel better.

Read more about the symptoms of flu

What to do

If you're otherwise fit and healthy, there's usually no need to see your GP if you have flu-like symptoms.

The best remedy is to rest at home, keep warm and drink plenty of water to avoid dehydration. You can take paracetamol or ibuprofen to lower a high temperature and relieve aches if necessary.

Stay off work or school until you're feeling better. For most people, this will take about a week.

Read more about treating flu at home

When to see your GP

Consider visiting your GP if:

• you're 65 years of age or over
• you're pregnant
• you have a long-term medical condition – such as diabetes, heart disease, lung disease, kidney disease or a neurological disease
• you have a weakened immune system – for example because you're having chemotherapy or have HIV
• you develop chest pain, shortness of breath, difficulty breathing or start coughing up blood
• your symptoms are getting worse over time or haven't improved after a week

In these situations, you may need medication to treat or prevent complications of flu. Your GP may recommend taking antiviral medicine to reduce your symptoms and help you recover more quickly.

Read more about antiviral medication for flu

How long does flu last and is it serious?

If you have flu, you generally start to feel ill within a few days of being infected.

You should begin to feel much better within a week or so, although you may feel tired for much longer.

You'll usually be most infectious from the day your symptoms start and for a further 3 to 7 days. Children and people with weaker immune systems may remain infectious for longer.

Most people will make a full recovery and won't experience any further problems, but elderly people and people with certain long-term medical conditions are more likely to have a bad case of flu or develop a serious complication, such as a chest infection.

Read more about the complications of flu

How you catch flu

The flu virus is contained in the millions of tiny droplets that come out of the nose and mouth when someone who is infected coughs or sneezes.

These droplets typically spread about one metre. They hang suspended in the air for a while before landing on surfaces, where the virus can survive for up to 24 hours.

Anyone who breathes in the droplets can catch flu. You can also catch the virus by touching the surfaces that the droplets have landed on if you pick up the virus on your hands and then touch your nose or mouth.

Everyday items at home and in public places can easily become contaminated with the flu virus, including food, door handles, remote controls, handrails, telephone handsets and computer keyboards. Therefore, it's important to wash your hands frequently.

You can catch flu many times because flu viruses change regularly and your body won't have a natural resistance to the new versions.

Preventing the spread of flu

You can help stop yourself catching flu or spreading it to others with good hygiene measures.

Always wash your hands regularly with soap and warm water, as well as:

• regularly cleaning surfaces such as your computer keyboard, telephone and door handles to get rid of germs
• using tissues to cover your mouth and nose when you cough or sneeze
• putting used tissues in a bin as soon as possible

You can also help stop the spread of flu by avoiding unnecessary contact with other people while you're infectious. You should stay off work or school until you're feeling better.

In some people at risk of more serious flu, an annual flu vaccine or antiviral medication may be recommended to help reduce the risk of becoming infected.

Read more about how to stop the spread of flu

What's the difference between a cold and a flu?