How long are you contagious after 24 hour stomach bug

Stomach bugs, also called gastroenteritis, are very common in young children and can cause vomiting, diarrhea and sometimes a fever. Gastroenteritis typically lasts in the neighborhood of three to seven days, but sometimes it can be shorter and, unfortunately, sometimes it lasts longer.

What causes stomach bugs?

Many stomach bugs are caused by viruses such as rotavirus and norovirus. Both are highly contagious viruses. A child or adult may become infected more than once, but, usually, the initial case is the most severe and subsequent infections are milder.

How to prevent stomach bugs

The best way to prevent catching a stomach bug: thorough hand washing. Everyone in your family should wash their hands with soap and water before eating and after using the bathroom. If you have an infant, be sure to follow proper handling and disposal of dirty diapers. Get more tips on how to prevent the stomach flu.

How to care for a child with a stomach bug at home

You can treat stomach bugs at home by making sure your child keeps drinking fluids and gets plenty of rest.

The best way to keep your child well hydrated is with an electrolyte-containing solution such as Pedialyte®. Have your child take small sips frequently — meaning every five minutes or so — throughout the day. Avoid having them fill their stomach too much at once, or it might come back up. Also avoid anything too high in sugar, such as soda, juices or sports drinks, as these might make the diarrhea worse. Water will prevent dehydration but doesn’t replace any of the salts or sugars that your child may be losing.

View this video with a transcript

For a breast-feeding infant, give breast milk or formula.

Your child might be fussy and resistant to drinking. It’s important to get through the first few times. As your child drinks, they’ll start feeling better.

Continue with solid food if your child can tolerate it. Your child may vomit a few times as they adjust. That’s OK. Take a step back by giving them smaller amounts of food and drink and work up from there. Soon your child will be back on the road to good health with lots of energy.

When to seek medical care

In most cases, you can safely care for a stomach bug at home. It is important, however, to watch for signs of dehydration, which can occur quickly, especially in infants.

Symptoms of dehydration include:

Lethargy
Irritability
Thirst
Paleness
Sunken eyes
Decreased urine output

If you have any concerns that your child is dehydrated, call your pediatrician or go to an urgent care or emergency department. For children younger than 6 months and children who have health problems that make dehydration more likely, call your doctor for advice.

Also seek medical care if your child has a fever that lasts several days, has severe abdominal pain, or has bloody diarrhea or vomit.

How to keep others in your household from getting sick

Rotavirus and norovirus may live on inanimate surfaces, such as doorknobs, toys and hard surfaces, for quite some time. If someone in your household vomits or has diarrhea due to a stomach bug, clean and disinfect hard surfaces in the area. Put on rubber or disposable gloves, clean up the area, then disinfect the area using a bleach-based household cleaner.

Anyone who is sick should not be in areas where food is being prepared.

Be diligent, and your family will get through this!

If you or your child get the stomach flu, it’s natural to wonder if everyone else in the family will get it too.

After all, many of us have caught an infection from a family member, friend, or coworker at some point in our lives.

However, the stomach flu is not actually a flu.

For one, the stomach flu is typically caused by norovirus, while influenza viruses cause the flu.

For another, the stomach flu (also called viral gastroenteritis) primarily affects the intestines and sometimes the stomach.

It does not cause upper-respiratory symptoms (like dry cough and nasal congestion) like the common flu does.

To help you and your loved ones stay healthy, in this article, we’ll explain if the stomach flu is contagious and how it spreads.

Then we’ll discuss symptoms and remedies for the stomach flu, followed by how to prevent viral gastroenteritis and when to see a doctor.

Is Stomach Flu Contagious?

The stomach flu is caused by norovirus or other similar viruses like rotavirus, adenovirus, or astrovirus.

These viruses are contagious and often lead to group or community-setting outbreaks such as in daycares, schools, nursing homes, or cruise ships.

How long does stomach flu last?

Most cases of viral gastroenteritis resolve on their own within a week.

People with weakened immune systems as well as young children and older adults are at greater risk of contracting stomach flu and may experience more severe symptoms.

How does stomach flu spread?

Most stomach flu is passed via a fecal-oral route of transmission.

As the name implies, this means that someone unknowingly ingested tiny particles of stool or vomit from an infected person. This can happen when:

Someone touches the stool of a sick person and then touches their face without washing their hands.

Someone touches the stool of an infected person and then touches a shared surface, such as a doorknob. If others touch that surface, they can pick up the germs and then touch their face without washing their hands.

People consume contaminated food or water.

Stomach Flu Symptoms

Common symptoms of stomach flu include:

Stomach cramps: Pain or discomfort in the abdomen is often the first sign of stomach flu. These cramps can be intense and are shortly followed by vomiting, diarrhea, or both.

Vomiting: You may vomit only a few times, or feel nauseated and vomit for several days.

Diarrhea: Diarrhea may occur after vomiting has stopped, or you may experience both symptoms together. Most people with the stomach flu go to the bathroom several times a day.

Body aches: Not everyone experiences body aches, but they can be a sign of the stomach flu. Some people also experience headaches.

Fever: A temperature up to 102.2° F (39°C) can occur as the body works to fight the virus.

Dehydration: Because vomiting and diarrhea lead to fluid losses, and the loss of electrolytes naturally occurs during this process, you may experience dehydration. You can be dehydrated without feeling thirsty. Other signs of dehydration include urinating less often, darker color urine, and sometimes dizziness.

Stomach Flu Remedies

Although there is no way to speed healing from the stomach flu, you can do many things at home to ease your symptoms and find comfort while your body recovers.

What you should eat

Studies have mixed results about the best foods to eat for viral gastroenteritis.

However, erring on the side of caution and sticking to a bland diet may help ease further discomfort if you vomit and may make it easier on your intestines as they recover from the virus.

Many doctors recommend some version of a BRAT diet once you are ready to eat.

BRAT stands for:

Bananas: In addition to being easy to digest, bananas contain potassium. Levels of this electrolyte may fall if you vomit often due to the stomach flu.

Rice: White rice is an easy-to-digest grain with a mild flavor, so even people who feel nauseated can typically stomach it. Or try rice cakes or rice crackers. (Due to the higher fiber content, brown rice is harder to digest and may aggravate an upset stomach.)

Apples: Apples and applesauce contain vitamins, are easy to digest, and take little time to prepare.

Toast: Toasted white bread (either plain or with a little butter or fruit spread) is another easy-on-the-digestive-tract food since it’s low in fiber. And the carbohydrates will provide some energy. Whole-grain breads (including whole-wheat bread) have more fiber and may be harder to digest and less tolerable when you have an upset stomach.

Foods you should avoid

When you have the stomach flu, avoid any food that worsens your nausea, vomiting, diarrhea, or other symptoms. While everyone is different, you may find it best to stay away from the following foods until you feel better:

Red meat: Although red meat contains beneficial nutrients (like iron and protein), leaner choices are easier for the digestive system to break down. Consider plain or lightly seasoned fish, chicken, or turkey instead.

Spicy foods: Chili peppers, hot sauce, and other spicy foods can significantly worsen the pain and discomfort of vomiting or diarrhea. Stick to mild flavors until your symptoms fully resolve.

Sugar: You may crave comfort foods like ice cream when you don’t feel well, but having sugary snacks and drinks (including sodas and sports drinks) may make diarrhea worse).

Dairy: Avoiding dairy, even yogurt, should be until you feel that the symptoms are starting to resolve.

Recovery and How to Prevent Stomach Flu

Because it is caused by a highly contagious family of viruses, it’s not always possible to prevent stomach flu. However, you can reduce the risk of getting sick by practicing some simple habits:

Wash your hands with warm soap and water on a regular basis, especially before eating, touching your face, or handling food.

Disinfect shared surfaces or things that you frequently touch, like your smartphone, car keys, doorknobs, and faucet handles.

Don’t share utensils, plates, or glasses.

Wash vegetables and fruit thoroughly before preparing or eating them.

If you still get the stomach flu, recovery typically does not take longer than a week. Most people only need rest, proper hydration, and sometimes over-the-counter medication or a bland diet to cope with the illness.

When to See a Doctor

If you believe you have the stomach flu and do not feel better after 5-7 days, check in with your doctor. You may have a different virus or may have developed a secondary infection.

Also see a healthcare provider if you notice:

A high fever
Blood in your stool
Symptoms of dehydration (such as dark urine, infrequent peeing, and lightheadedness
Localizing stomach pains (pain that sits in one spot more than another)
Hardness/swelling to one part of your abdomen

How K Health Can Help

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Check your symptoms, explore conditions and treatments, and if needed, text with a healthcare provider in minutes.

K Health’s AI-powered app is HIPAA compliant and is based on 20 years of clinical data.

Frequently Asked Questions

How long are you contagious with the stomach flu?

How long you’re contagious with stomach flu depends on which virus you have. If you have a norovirus, you’re typically contagious from the moment you begin to have symptoms until a few days or possibly a few weeks after you recover. If you have rotavirus, you could be contagious for 1-2 weeks after your symptoms have ended. Continue to practice good hygiene and stay home until your symptoms have been gone for 24-48 hours.

Can you pass stomach flu to another person?

The viruses that cause stomach flu are highly contagious. They can be passed from fecal-oral contamination, surface contamination, and by particles in the air that are released when someone vomits or coughs.

K Health articles are all written and reviewed by MDs, PhDs, NPs, or PharmDs and are for informational purposes only. This information does not constitute and should not be relied on for professional medical advice. Always talk to your doctor about the risks and benefits of any treatment.

Is a 24 hour stomach bug contagious?

The 24-hour flu is very contagious, meaning that it can spread easily from person-to-person. You can become infected in the following ways: Having close contact with a person who has the infection. Coming into contact with a surface or object that's been contaminated.

How long are you contagious with stomach bug?

However, studies have shown that you can still spread norovirus for two weeks or more after you feel better. Norovirus can easily contaminate food and water because it only takes a very small amount of virus particles to make you sick.

Are you contagious 48 hours after vomiting?

Norovirus is most infectious from the start of symptoms until 48 hours after all symptoms have stopped. You may also be infectious for a short time before and after this. You can get norovirus more than once because the virus is always changing and your body is unable to build up long-term resistance to it.

How long are you contagious after 24 hour gastro?

Gastroenteritis is a contagious illness. An infected person can transmit the illness as long they have symptoms and up to 2 weeks after they have disappeared. He or she can be contagious even a few weeks after symptoms have subsided.