What is Viral Gastroenteritis?

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Viral gastroenteritis is a type of gastroenteritis – a common condition sometimes called stomach flu or food poisoning. Gastroenteritis is the result of irritation and inflammation in the stomach and intestines. It can be caused by infection with a virus such as rotavirus, bacteria, or parasites, among other things. When caused by a virus, it is called viral gastroenteritis. While it can be very unpleasant, most cases of viral gastroenteritis can be treated at home, and clear up within a few days without causing complications.^[1][2]

Symptoms of viral gastroenteritis can range from mild to severe and vary among people. However, the main symptoms are typically vomiting and mild fever, which develop quickly, followed by watery diarrhea for a few days.^[3]

Viral gastroenteritis can be caused by a number of different types of viruses, including rotavirus, norovirus, and adenovirus.^[3] The viruses can be transmitted directly from one person to another or spread through contaminated food and water. Depending on the source of infection, a large group of people may develop viral gastroenteritis at the same time, e.g. an outbreak on a cruise ship or at a summer camp.^[4]

Treatment for viral gastroenteritis typically involves:^[4][1]

• Resting at home
• Drinking plenty of fluids to avoid dehydration
• When necessary, taking medication to relieve nausea and diarrhea

In some cases, when a person is not able to keep fluids down and is becoming dehydrated, replacement of fluids through an intravenous (IV) drip at a hospital may be necessary. Antibiotics are not helpful for viral gastroenteritis.

Generally, people make a full recovery, and viral gastroenteritis does not cause any complications. However, if it occurs in a person with a weakened immune system, someone who is pregnant, very young or elderly, or someone with a chronic condition such as diabetes, viral gastroenteritis can be serious, and medical advice should be sought without delay. In addition, anyone experiencing severe symptoms should see a doctor immediately. Furthermore, if symptoms are mild but do not improve within a few days, or where a person has recently returned from travel abroad, medical advice should be sought.^[4][1]

Viral gastroenteritis can affect adults and children (see pediatric viral gastroenteritis) of all ages. It is very contagious and can be spread easily. For this reason, it is important for people who have viral gastroenteritis to take steps to avoid passing it on to others, such as practicing good personal hygiene and avoiding the preparation of food for other people. In general, the following can help to reduce the likelihood of developing gastroenteritis:^[1][3][5]

• Washing one’s hands well after using the toilet
• Taking precautions to ensure food is prepared, cooked and stored properly
• Avoiding consumption of inadequately-treated or untreated water
• Having babies vaccinated against rotavirus

Symptoms of viral gastroenteritis

The main signs and symptoms of viral gastroenteritis include:^{[6][4][3][7][8][9]}

• Nausea and/or vomiting
• Watery diarrhea; mucus and blood are not usually present

Other symptoms may include:^{[6][4][3][7][8][9]}

• Abdominal (belly) pain
• Low-grade fever
• Headache
• Muscle aches
• Chills

Symptoms may be mild or more severe and may vary depending on the particular virus. They tend to develop quickly. Worried you may have gastroenteritis? Adoctor conditions and symptoms

If symptoms are severe or do not begin to improve within 2-3 days, it is important to contact a doctor without delay. Furthermore, medical attention should be sought immediately if:

• There are any indications of serious dehydration, such as passing little to no urine or dizziness that does not go away
• There is blood, pus or a black color in the diarrhea
• There is constant vomiting that makes it impossible to keep down fluids
• There is very intense abdominal pain
• There is a fever over 38 degrees Celsius (101 F), in adults or children

In addition, a doctor should be contacted urgently if the affected person:

• Has recently returned from overseas travel
• Is pregnant
• Is a very young child
• Is an elderly person
• Has a weakened immune system
• Has a chronic condition such as inflammatory bowel disease, Crohn’s disease or diabetes

Causes of viral gastroenteritis

Viral gastroenteritis can be caused by many different viruses, including:^[3][8]

• Norovirus
• Rotavirus
• Astrovirus
• Adenovirus
• Sapovirus

The viruses can be transmitted easily from one person to another through close contact, for example by touching a person with viral gastroenteritis and then touching one’s mouth, or sharing food, cutlery, or towels with the person. Another route of transmission is touching a contaminated surface or object, such as a doorknob, counter, or changing table, and then touching one’s mouth. Infection can also occur through the consumption of contaminated food and drinks, such as in the case of:^{[6][10][7][8][9]}

• Unhygienic food preparation, e.g. a cook not washing their hands after going to the toilet
• Inadequately-treated drinking water

Diagnosis of viral gastroenteritis

When symptoms are mild, a diagnosis of viral gastroenteritis can often be made without seeing a doctor, and the condition can be treated at home.^[1] However, if there is any uncertainty or concern over the condition or symptoms being severe, seeing a doctor is very important.

A doctor will take the person’s medical history and perform a physical examination, taking care to rule out other common gastrointestinal conditions such as gastritis. In most cases, it will not be necessary to order tests to confirm the diagnosis of gastroenteritis. However, in cases that are severe or long-lasting, a doctor may request blood and/or stool tests to investigate.

Viral gastroenteritis treatment

Most cases of viral gastroenteritis clear up without specific medical treatment.^[8] As long as symptoms are not severe and there are no signs of dehydration, a person can generally treat viral gastroenteritis in an adult or child at home.

Home remedies

The following home remedies and over-the-counter treatment approaches are recommended for mild cases of viral gastroenteritis:^{[4][1][7][8][9]}

• Bed rest
• Consuming plenty of fluids in the form of water or oral rehydration drinks; at the very least, small sips should be taken between being sick or having bowel movements
• Eating light meals when appetite returns; plain foods like bread and rice may be helpful
• Taking an antidiarrheal medication, e.g. loperamide, only when necessary and there is no fever, and no blood or mucus is present in the stool
• Taking antiemetic (anti-nausea) medication for nausea and vomiting, when necessary
• Taking probiotics may slightly shorten the duration of diarrhea

If a person is unable to keep any fluids down or shows signs of dehydration (see below), they may need to be treated with an IV drip at a hospital.

Good to know: Antibiotics are not prescribed for viral gastroenteritis, as they are not effective against viruses. Antibiotics are only effective against bacteria. In a severe case of bacterial gastroenteritis, a course of antibiotics may be recommended.

Complications of viral gastroenteritis

In most cases, an episode of viral gastroenteritis clears up completely, without causing any long-term problems or complications.^[6] However, in a few cases, there may be complications. The risk of developing complications from viral gastroenteritis is highest in very young children, elderly people and people who have a chronic condition such as diabetes, or a weakened immune system.^[1][7]

Dehydration

Dehydration is the most common complication of viral gastroenteritis.^[1][9]

Signs and symptoms of dehydration in adults include:^[11]

• Tiredness
• Dizziness
• Headache
• Muscle cramps
• Urinating less and dark-colored urine
• Dry mouth
• Eyes appearing sunken in the head
• Weakness

In addition to the above, signs of dehydration in children can include:^[11]

• Drowsiness or irritability
• Increased heart rate
• Fewer wet nappies
• No tears when crying

If signs and symptoms of dehydration do not go away with the replacement of lost fluids or if a person is unable to keep fluids down, a doctor should be seen immediately. Dehydration can be extremely serious for both children and adults.

Other complications

Other possible complications of viral gastroenteritis include:^[1][5]

• Reduced effectiveness of medications, e.g. birth control pills or diabetes medicine
• Temporary intolerance to lactose, the sugar in cow’s milk
• Irritable bowel syndrome

Rare complications from viral gastroenteritis include:^[1][5]

• Reactive inflammation in other parts of the body, causing conditions like reactive arthritis
• Persistent diarrhea
• Bleeding in the gastrointestinal tract^[12]
• Guillain-Barre syndrome, a serious condition in which the body’s immune system mistakenly attacks the nerves

Prevention of viral gastroenteritis

Good personal and food hygiene, as well as the use of water from clean, adequately-treated sources only, can help to reduce a person’s risk of developing viral gastroenteritis.

Practicing good hygiene

The following general precautions are recommended:^{[6][10][13][1]}

• Always wash your hands well with soap and water or use an alcohol-based hand sanitizer after using the toilet
• Always wash your hands well before preparing food
• Wash fruit and vegetables in clean water before using them
• Cook food thoroughly
• Regularly clean kitchen work surfaces with a disinfectant
• When traveling to other countries, drink only bottled water or water that has been boiled for at least 10 minutes, and only eat food that has been well cooked and fruit that can be peeled

If you have viral gastroenteritis, doing the following can help to prevent its spread:^[6][10][1]

• Wash your hands well with soap and water or use an alcohol-based hand sanitizer after using the toilet
• Clean the toilet and bathroom thoroughly with disinfectant on a daily basis
• Avoid sharing cutlery, towels, clothing and linen, also wash your items separately in hot water, with bleach if possible
• Avoid preparing food for other people for at least two days after the vomiting or diarrhea has cleared up
• Stay off work or school, if possible, until at least two days after the vomiting or diarrhea has cleared up
• Avoid swimming for two weeks after the vomiting or diarrhea has cleared up

Vaccinations for viral gastroenteritis

Viral gastroenteritis in infants can be very serious. To reduce the likelihood of it occurring, it is possible for babies to receive a course of rotavirus vaccinations. These injections are generally considered to be safe and effective against most strains of rotavirus and form part of the recommended infant vaccination schedule in some countries.^{[4][14][15][16][17]}

Viral gastroenteritis FAQs

Other names for viral gastroenteritis

• Stomach flu, gastric flu
• Stomach bug, tummy bug
• Stomach virus
• Norovirus
• Rotavirus
• Food poisoning

---

1. Patient (Consumer). “Gastroenteritis.” September 20, 2017. Accessed July 27, 2018. ↩ ↩ ↩ ↩ ↩ ↩ ↩ ↩ ↩ ↩ ↩ ↩ ↩

2. Patient (Pro). “Gastroenteritis in Children.” December 15, 2014. Accessed July 27, 2018. ↩ ↩

3. Medscape. “Viral Gastroenteritis.” January 8, 2018. Accessed July 30, 2018. ↩ ↩ ↩ ↩ ↩ ↩ ↩

4. Merck Manuals. “Overview of Gastroenteritis.” May, 2017. Accessed July 27, 2018. ↩ ↩ ↩ ↩ ↩ ↩ ↩ ↩

5. Patient (Pro). “Gastroenteritis in Adults and Older Children.” December 1, 2014. Accessed July 30, 2018. ↩ ↩ ↩

6. San Francisco Department of of Public Health. “Viral Gastroenteritis and Norovirus.” Accessed July 27, 2018. ↩ ↩ ↩ ↩ ↩ ↩ ↩

7. NSW Government Health. “Viral gastroenteritis fact sheet.” July 27, 2018. Accessed August 1, 2018. ↩ ↩ ↩ ↩ ↩

8. National Institute of Diabetes and Digestive and Kidney Diseases. “Viral Gastroenteritis (‘Stomach Flu’).” May, 2018. Accessed August 1, 2018. ↩ ↩ ↩ ↩ ↩ ↩

9. Cedars-Sinai Medical Center. “Viral Gastroenteritis.” Accessed August 1, 2018. ↩ ↩ ↩ ↩ ↩

10. University Health Services, University of Notre Dame. “Stop the spread of norovirus.” August, 2011. Accessed July 27, 2018. ↩ ↩ ↩ ↩

11. Patient (Consumer). “Traveller’s Diarrhea.” November 28, 2017. Accessed August 3, 2018. ↩ ↩

12. Open Forum Infectious Diseases. “Gastroduodenal Perforation and Ulcer Associated With Rotavirus and Norovirus Infections in Japanese Children: A Case Report and Comprehensive Literature Review.” January, 2016. Accessed August 3, 2018. ↩

13. Healthline. “Viral Gastroenteritis (Stomach Flu).” April 25, 2018. Accessed July 27, 2018. ↩ ↩

14. Amboss. “Rotavirus infection (Rotavirus gastroenteritis).” April 1, 2018. Accessed August 3, 2018. ↩

15. World Health Organization. “Statement on risks and benefits of rotavirus vaccines Rotarix and RotaTeq.” Accessed August 3, 2018. ↩

16. Centers for Disease Control and Prevention. “Rotavirus Vaccination.” November 22, 2016. Accessed August 3, 2018. ↩

17. Better Health Channel. “Rotavirus – immunisation.” June, 2017. Accessed August 3, 2018. ↩

18. Healthline. “BRAT Diet: What Is It and Does It Work?” June 8, 2017. Accessed July 27, 2018. ↩

19. Adoctor. “Gastroenteritis.” Accessed July 27, 2018. ↩

20. Mayo Clinic. “Viral gastroenteritis (stomach flu).” December 2, 2014. Accessed July 27, 2018. ↩ ↩ ↩

21. Student Health & Wellness Center, Homewood Student Affairs, John Hopkins University. “Viral Gastroenteritis (Stomach Flu).” December, 2017. Accessed July 27, 2018. ↩

22. Harvard Health Publishing. “Gastroenteritis In Adults.” May, 2017. Accessed December 12, 2018. ↩

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## What is Viral Gastroenteritis? ##



**Question: What is viral gastroenteritis?**



**Answer:** Viral gastroenteritis, also⁤ known ⁢as the stomach flu, is a common viral infection that affects the digestive system, causing inflammation of the ‍stomach ⁣and intestines. It⁣ is highly contagious and often spreads through ⁤contact with infected individuals or contaminated food ​or water.



**Keywords:** viral gastroenteritis, stomach flu, ​digestive system, inflammation,​ contagious



**Question: What are the symptoms of viral gastroenteritis?**



**Answer:** Symptoms can vary in intensity and include:



* Diarrhea

* Vomiting

* Nausea

* Abdominal cramps

* Fever

* Chills

* Headache

* Muscle aches



**Keywords:** diarrhea, ‍vomiting, nausea, abdominal cramps, fever, chills, headache, muscle aches



**Question: How​ is viral gastroenteritis diagnosed?**



**Answer:** Diagnosis is‍ typically based on symptoms and a physical⁣ examination. In some cases, a stool sample may be tested ⁢to confirm the presence of the virus.



**Keywords:** diagnosis, symptoms, physical examination, stool sample



**Question: How is viral​ gastroenteritis treated?**



**Answer:** Treatment focuses‍ on managing symptoms and preventing dehydration. It includes:



* Oral rehydration solutions to replenish fluids and⁣ electrolytes

* ⁤Rest

* Over-the-counter antidiarrheal medications

* Antiviral⁢ medications in severe‍ cases



**Keywords:** treatment, oral rehydration solutions, rest, antidiarrheal medications, antiviral medications



**Question: How can viral gastroenteritis be ‌prevented?**



**Answer:** Prevention is essential:



* ⁣Wash hands frequently‌ with soap and water, especially after using the bathroom or handling food

* Disinfect surfaces and objects⁤ that may be‌ contaminated

* ‍Cook food thoroughly,⁢ especially meats and seafood

* Avoid consuming raw or undercooked shellfish

* Drink pasteurized milk and juice



**Keywords:** prevention, wash hands,⁢ disinfect surfaces, cook ⁢food thoroughly, avoid raw shellfish, pasteurized⁢ milk



**Question: When should I seek medical attention for viral gastroenteritis?**



**Answer:** Seek medical attention if ⁤symptoms⁣ worsen, including:



* Severe diarrhea or vomiting

* Signs of dehydration, such ⁢as dry ⁢mouth, sunken eyes, or ‍infrequent urination

* Fever​ over 101 degrees Fahrenheit

* Bloody stools



**Keywords:** medical attention, severe symptoms,​ dehydration, ‌fever, bloody stools