eMedicine Specialties > Gastroenterology > Intestine
Gastroenteritis, Viral: Follow-up
Updated: Nov 12, 2008
Follow-up
Deterrence/Prevention
- Natural infection with rotavirus does not afford complete immunity, and multiple infections in the first few years of life probably are common; however, immune response to these infections reduces the frequency and severity of subsequent rotavirus infection.
- On February 21, 2006, the CDC Advisory Committee on Immunization Practices (ACIP) recommended RotaTeq, an oral attenuated pentavalent rotavirus vaccine (PRV), for the vaccination of infants. Three doses should be given at 2, 4, and 6 months. The third dose should be given no later than 32 weeks.
- In the REST trial, a double-blind placebo-controlled trial of over 60,000 infants, RotaTeq demonstrated a 74% reduction in all rotavirus cases. There was a 98% reduction in severe cases and a 96% reduction in hospitalized cases.
- Of note, there was a 59% reduction in all-cause gastroenteritis admissions, highlighting rotavirus as a larger contributor to the cause of acute gastroenteritis than originally expected.
- The oral live attenuated vaccine was not tested in immunocompromised patients and not approved for this use.
- There was no association of RotaTeq with intussusceptions in this trial. The former RotaShield vaccine was pulled from the market for increased intussusceptions. However, this risk was only seen in older infants. The RotaTeq trial did not test older infants. For these reasons, the RotaTeq vaccine is not approved for infants older than 32 weeks, and a "catch-up" vaccination is not recommended.
- There are some questions as to the efficacy in less developed countries where the vaccine was not tested and nonvaccine serotypes (VP4, VP6, and VP7) are more prevalent.
- RotaShield is not approved for use, but it is being considered for reintroduction into the marketplace in limited use for early infant vaccination only.
- In April 2008, the United States Food and Drug Administration (FDA) approved a new vaccine for rotavirus gastroenteritis.8 Rotarix is a monovalent vaccine derived from the most common human rotavirus strain that has been attenuated by serial passage and is administered in 2 oral doses, 1-2 months apart.9
- The phase 3 trial of Rotarix reported the following results:10
- Rotarix was highly protective against severe rotavirus gastroenteritis (85%) and hospitalization for severe rotavirus gastroenteritis (85%).
- The vaccine was also protective against gastroenteritis of any cause (40%) and hospitalization for gastroenteritis of any cause (42%).
- Infants vaccinated with Rotarix had fewer serious adverse events or required hospitalization because of gastrointestinal events.
- The vaccine proved to be safe with respect to the risk of intussusceptions. The observed risk estimate was below the initial risk increase of 4 per 100,000 that led to the withdrawal of the RotaShield vaccine, and it was also below the subsequent consensus risk estimate of 1 per 100,000 for that vaccine.
- The Rotarix vaccine strain replicates well in the gut after the first dose and provides cross-protection against most other serotypes. RotaTeq, on the other hand, is not so broadly cross-protective and grows less well in human intestines. In addition, the vaccine strains are infrequently shed in the stool, and 3 doses are required.9
- Recommendations from the American Academy of Pediatrics and the CDC for the use of Rotarix are pending.11
- The phase 3 trial of Rotarix reported the following results:10
- Research on a vaccine for calicivirus infection is proceeding rapidly. Baculovirus-produced antigens spontaneously form virus-like particles without RNA that are immunogenic and possibly protective. Genomes also can be inserted into edible foodstuffs (eg, potatoes, bananas).
- Proper hygiene is still the first preventative step in viral gastroenteritis. Hand washing to prevent fecal-oral transmission is very important. It also includes properly handling food and using clean water supplies.
- On a community level, proper sanitation, clean water supplies, and surveillance programs for outbreaks are important steps in prevention.
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References
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Further Reading
Keywords
viral gastroenteritis, rotavirus, rotaviruses, stomach flu, diarrhea, dysentery, watery diarrhea, nausea, intestinal flu, infectious diarrhea, traveler's diarrhea, food poisoning, caliciviruses, astroviruses, adenoviruses, Norovirus, Norwalk-like virus, Norwalk virus, Sapovirus, Sapporo-like virus, sporadic infantile viral gastroenteritis, sporadic adult viral gastroenteritis, Clostridium difficile, Giardia lamblia
Follow-up: Gastroenteritis, Viral