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Viral Gastroenteritis

Yesterday, you were enjoying a tasty meal at your favorite restaurant, and now you're doubled over with pain. These symptoms could be those of viral gastroenteritis — an intestinal infection marked by watery diarrhea, abdominal cramps, nausea or vomiting, and sometimes fever.

You usually develop viral gastroenteritis — often called stomach flu — after contact with an infected person or because you've ingested contaminated food or water. If you're otherwise healthy, you'll likely recover without complications. But for infants, older adults and people with compromised immune systems, viral gastroenteritis can be deadly.

There's no effective treatment for viral gastroenteritis, so prevention is key. In addition to avoiding food and water that may be contaminated, thorough and frequent hand washing is your best defense.


You're most likely to contract viral gastroenteritis when you eat or drink contaminated food or water, or if you share utensils, towels or food with someone who's infected.

Some shellfish, especially raw or undercooked oysters, can make you sick. Contaminated drinking water also can cause viral diarrhea. But in many cases, the virus is passed through the fecal-oral route — that is, someone with the virus handles food you eat without washing his or her hands after using the bathroom.

A number of viruses can be the cause of gastroenteritis, including:
  • Rotavirus. This is the most common cause of infectious diarrhea in infants and children worldwide — it's also a leading cause of death among children. Every year, thousands of children are hospitalized with complications of the infection. Your child is likely to have rotavirus at least once before age 5. Children are usually infected when they put their fingers or other objects contaminated with the virus into their mouths.

    Adults who are infected with rotavirus usually don't develop symptoms, but can still spread the illness. Some people, particularly those in institutional settings, may spread the virus even though they don't have any symptoms of illness themselves.

    A vaccine against rotaviral gastroenteritis is available in some countries, including the United States, and appears to be effective in preventing severe symptoms. Talk to your doctor about whether to immunize your child.

  • Noroviruses. There are many different strains of noroviruses, including Norwalk virus, that all cause similar symptoms. In addition to diarrhea, nausea and vomiting, you may experience muscle aches, headache, fatigue and low-grade fever.

    Both children and adults are affected by noroviruses. Norovirus infection can sweep through families and communities. It's especially likely to spread among people in confined spaces. In most cases you pick up the virus from contaminated food or water, although person-to-person transmission also is possible.

    After exposure to the virus, you're likely to feel sick within 18 to 72 hours. Most people feel better in a day or two, but you're still contagious for at least three days — and up to two weeks — after you've recovered.

Risk Factor :
Gastroenteritis occurs all over the world, affecting people of every age, race and background. In developing nations, it's a leading cause of death in children.

Children in child care centers and older adults living in nursing homes are especially vulnerable. That's because children's immune systems aren't mature until about age 6, and adult immune systems tend to become less efficient later in life.

Intestinal infections can flourish anywhere people congregate — from schools and dormitories to campgrounds and luxury cruise ships. Adults whose resistance is low — often because their immune systems are compromised by HIV, AIDS or other medical conditions — are especially at risk.

Each gastrointestinal virus has a season when it's most active. If you live in the Northern Hemisphere, you're more likely to get rotavirus or the Norwalk virus between October and April.

When to seek medical advice :
If you're an adult, call your doctor if :

  • You're not able to keep liquids down for 24 hours.
  • You've been vomiting for more than two days.
  • You're vomiting blood.
  • You're dehydrated. Signs of dehydration include excessive thirst, dry mouth, deep yellow urine or little or no urine, and severe weakness, dizziness or lightheadedness.
  • You notice blood in your bowel movements.
  • You have a fever above 104 F.

See your doctor right away if your child :

  • Has a temperature of 102 F or higher
  • Seems lethargic or very irritable
  • Is in a lot of discomfort or pain
  • Has bloody diarrhea
  • Seems dehydrated — watch for signs of dehydration in sick infants and children by comparing how much they drink and urinate with how much is normal for them

If you have an infant, remember that while spitting up may be an everyday occurrence for your baby, vomiting is not. Babies vomit for a variety of reasons, many of which may require medical attention.

Call your baby's doctor right away if your baby's vomiting lasts more than several hours or if your baby has any of the following signs and Symptoms:

  • Hasn't had a wet diaper in six hours
  • Has bloody stools or severe diarrhea
  • Has a sunken fontanel (the soft spot on the top of a baby's head)
  • Has a dry mouth or cries without tears
  • Is unusually sleepy, drowsy or unresponsive

Symptoms :
Although it's commonly called stomach flu, gastroenteritis isn't the same as influenza. Real flu (influenza) affects your respiratory system — your nose, throat and lungs. Gastroenteritis, on the other hand, attacks your intestines, causing signs and symptoms such as :

  • Watery, usually nonbloody diarrhea. Bloody diarrhea usually means you have a different, more severe infection.
  • Abdominal cramps and pain.
  • Nausea, vomiting or both.
  • Occasional muscle aches or headache.
  • Low-grade fever.

Depending on the cause, viral gastroenteritis symptoms may appear within one to three days after you're infected and can range from mild to severe. Symptoms usually last just a day or two, but occasionally they may persist as long as 10 days.

Because the symptoms are similar, it's easy to confuse viral diarrhea with diarrhea caused by bacteria such as salmonella and Escherichia coli (E. coli) or parasites such as giardia.

Diagnosis :
Your doctor will likely diagnose gastroenteritis based on symptoms, a physical exam and sometimes on the presence of similar cases in your community. A rapid stool test can detect rotavirus, but there are no quick tests for other viruses that cause gastroenteritis. In some cases your doctor may have you submit a stool sample to rule out a possible bacterial or parasitic infection.

Complications :
Dehydration — a severe loss of water and essential salts and minerals — is the most common serious complication of gastroenteritis. If you're a healthy adult and drink enough to replace fluids you lose from vomiting and diarrhea, dehydration shouldn't be a problem.

But infants, older adults and people with suppressed immune systems may become severely dehydrated when they lose more fluids than they can replace. In that case, they may need to be hospitalized and receive intravenous fluids. In extreme cases dehydration can be fatal.

There's often no specific medical treatment for gastroenteritis. Antibiotics aren't effective against viruses, and overusing them can contribute to the development of antibiotic-resistant strains of bacteria. Treatment consists of self-care steps.

The best way to prevent the spread of intestinal infections is to follow these common-sense precautions :

  • Wash your hands thoroughly. And make sure your children do, too. If your children are older, teach them to wash their hands, especially after using the bathroom. It's best to use warm water and soap and to rub hands vigorously for at least 20 seconds, remembering to wash around cuticles, beneath fingernails and in the creases of the hands. Then rinse thoroughly. Carry towelettes for times when soap and water aren't available.
  • Use separate personal items around your home. Avoid sharing eating utensils, glasses and plates. Use separate towels in the bathroom.
  • Keep your distance. Avoid close contact with anyone who has the virus, if possible.
  • Check out your child care center. Make sure the center has separate rooms for changing diapers and preparing or serving food. The room with the diaper-changing table should have a sink as well as a sanitary way to dispose of diapers.
Take precautions when traveling
When you're traveling in other countries, you can become sick from contaminated food or water. To help reduce your risk:
  • Drink only well-sealed bottled or carbonated water.
  • Avoid ice cubes, because ice cubes may be made from contaminated water.
  • Use bottled water to brush your teeth.
  • Avoid raw food — including peeled fruits, raw vegetables and salads — that has been touched by human hands.
  • Avoid undercooked meat and fish.
  • Get vaccinated. A vaccine against gastroenteritis caused by the rotavirus is available in some countries, including the United States, and appears to be effective in preventing severe symptoms of this illness.
Please be aware that this information is provided to supplement the care provided by your physician. It is neither intended nor implied to be a substitute for professional medical advice. CALL YOUR HEALTHCARE PROVIDER IMMEDIATELY IF YOU THINK YOU MAY HAVE A MEDICAL EMERGENCY. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with any questions you may have regarding a medical condition.
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