Viral Gastroenteritis Clinical Presentation
- Author: Michael Vincent F Tablang, MD; Chief Editor: Julian Katz, MD more...
History
The clinical spectrum of acute viral gastroenteritis ranges from asymptomatic infection to severe dehydration and death. Viral gastroenteritis typically presents with short prodrome, with mild fever and vomiting, followed by 1-4 days of nonbloody, watery diarrhea. Viral gastroenteritis is usually self-limited.
- The history should focus on severity and dehydration. The onset, frequency, quantity, and duration of diarrhea and vomiting are important factors in assessing the status. Oral intake, urine output, and weight loss are important considerations. Viruses are the suspected cause of acute gastroenteritis when vomiting is prominent, when the incubation period is longer than 14 hours, and when the entire illness is over in less than 3 days. Travel history (including cruise ships), eating history, and daycare history are important epidemiological factors.
- A viral cause should be suspected when the warning signs of bacterial infection (ie, high fever, bloody diarrhea, severe abdominal pain, >6 stools/24 h) are absent and an alternative diagnosis is not suggested by epidemiologic clues from the history (eg, travel, sexual practices, antibiotic use).
- Factors associated with severe and prolonged disease are immunodeficiency and immune suppression, comorbid disease, and malnutrition.
- Death results from dehydration and acidosis.
- Ruling out other diagnoses is important. Mucus or overt blood in the stool almost always indicates bacterial or parasitic infection.
In 1982, the Kaplan criteria were established to distinguish outbreaks due to norovirus from outbreaks of bacterial etiology. The criteria are highly specific (99%) and moderately sensitive (68%). The 4 criteria indicative of an outbreak due to norovirus are as follows:[11]
- Vomiting in 50% of affected persons in the outbreak
- Mean incubation period of 24-48 hours
- Mean duration of illness of 12-60 hours
- Lack of identification of a bacterial pathogen in stool culture
Physical
The physical examination can be helpful in determining the etiology of gastroenteritis and in assessing the presence and degree of dehydration.
- Temperature, blood pressure and pulse, and body weight can provide evidence of severity of the condition.
- Temperature may be slightly elevated. High fever suggests bacterial infection. Tachycardia, thready pulse, and hypotension suggest severe dehydration.
- The degree of weight loss may be related to dehydration and the duration of the diarrhea.
- The mucous membranes and the skin should be examined carefully. Dry mouth, no tears, skin tenting, dry skin, and capillary refill are all signs of dehydration.
- The mental status in elderly patients and infants may be abnormal, especially when blood pressure and circulation are compromised.
- The abdominal examination may demonstrate mild tenderness. Severe abdominal pain and tenderness suggest bacterial infection or an abdominal emergency.
Causes
- Sporadic infantile viral gastroenteritis
- Group A rotavirus causes 25-65% of severe infantile gastroenteritis worldwide.
- Acute infections with group C are quite frequent in the United States and worldwide.
- After rotavirus, the most important cause of acute infantile gastroenteritis probably is calicivirus infection. Seroepidemiologic studies have shown that antibodies to caliciviruses are present in 50-90% of children younger than 2 years in Kuwait, Italy, Kenya, China, London, and South Africa. Using broadly reactive reverse-transcription polymerase chain reaction for calicivirus to study stool specimens from children with acute gastroenteritis, studies have found these viruses in 7-22% of cases.
- Astrovirus infection is associated with 2-9% of cases of infantile gastroenteritis worldwide, making it the third most frequent cause after rotavirus and calicivirus. The burden of astrovirus disease in developing countries might be especially high.
- Researchers have recognized for a long time that certain enteric adenoviruses are an important cause of infantile gastroenteritis. Studies confirm that they cause 2-6% of cases.
- Epidemic viral gastroenteritis
- Most cases of epidemic viral gastroenteritis in adults and children are caused by the caliciviruses. Some examples include Norovirus (formerly called Norwalk-like viruses), genogroup I (eg, Norwalk, Southampton, Desert Shield, Cruise Ship); Norovirus (formerly Norwalk-like viruses), genogroup II (eg, Snow Mountain, Mexico, White River, Lordsdale, Bristol, Camberwell, Toronto, Hawaii, Melksham); and Sapovirus (formerly Sapporo-like viruses), which sometimes are referred to as genogroup III, although they are not like Norwalk (eg, Sapporo, Parkville, Manchester, Houston, London).
- Modern molecular diagnostic techniques, such as broadly reactive reverse-transcription polymerase chain reaction, have linked these viruses to epidemics associated with oysters, contaminated community water supplies, restaurant food, hospital patients and staff, day care facilities, nursing homes, college dormitories, military ships, cruise ships, and vacation spots.
- Rotavirus and astrovirus also may cause epidemics of viral gastroenteritis.
- Sporadic adult viral gastroenteritis
- Few studies have examined the causes of sporadic cases of adult viral gastroenteritis.
- Seroepidemiologic evidence suggests that the etiologies are (in descending order of frequency) caliciviruses, non–group A rotavirus, astrovirus, and adenovirus.
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