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Intestinal and serum immune response to a naturally acquired rotavirus gastroenteritis in children
Insights
Rotavirus infection in children triggers a rapid increase in serum immunoglobulin A (IgA) and secretory Ig (ScIg). Rotavirus IgA remains detectable for at least six months, aiding future vaccine development.
Area of Science:
- Immunology
- Pediatrics
- Virology
Background:
- Acute gastroenteritis is a common childhood illness.
- Rotavirus is a leading cause of severe gastroenteritis in young children.
- Understanding the immune response to rotavirus is crucial for developing effective interventions.
Purpose of the Study:
- To investigate the dynamics of specific antibody responses in children following rotavirus infection.
- To differentiate serological markers between rotavirus and non-rotavirus acute gastroenteritis.
- To assess the correlation between serum and intestinal immune responses.
Main Methods:
- Serological analysis of serum and duodenal fluid samples from children hospitalized with acute gastroenteritis.
- Quantification of rotavirus-specific IgA, IgG, and secretory Ig (ScIg).
- Comparison of immune responses in children with confirmed rotavirus infection versus those without.
Main Results:
- Rotavirus infection led to a rapid increase in serum rotavirus IgA and ScIg.
- Serum rotavirus IgA persisted for over 6 months, while ScIg decreased within 4 months.
- Patients with non-rotavirus gastroenteritis lacked these specific serological markers.
- Serum and intestinal levels of rotavirus IgA and ScIg showed parallel changes during infection and recovery.
Conclusions:
- Distinct serological profiles differentiate rotavirus from other causes of acute gastroenteritis in children.
- The persistence of rotavirus-specific IgA suggests long-term immunity.
- These findings provide valuable insights for evaluating rotavirus vaccines and understanding natural immunity.
Abstract:
Seventeen children (mean age: 2.0 years, range: 36 days-8 years) hospitalized with acute gastroenteritis were investigated. Thirteen children had a rotavirus infection while four did not. Rotavirus serum IgA as well as ScIg, i.e., antirotavirus immunoglobulin containing secretory component, increased rapidly after rotavirus infection. While rotavirus IgA persisted in serum for at least 6 months, rotavirus ScIg disappeared from serum in less than 4 months. Rotavirus IgG could be detected in serum during the early stage of the infection and was still high after 6 months. The patients with nonrotavirus acute gastroenteritis did not show any of the above-mentioned serological hallmarks of those with rotavirus infection. The amounts of rotavirus ScIg found in serum about 1 week after the infection correlated to the amounts of rotavirus ScIg in duodenal fluid. Six months after the infection, rotavirus IgA was found in the feces of the majority of the patients while rotavirus ScIg could be detected only in one patient. The amounts of rotavirus IgA in sera and intestinal secretions showed identical patterns in the acute phase of the disease as well as after recovery. The same applied to rotavirus ScIg. These findings could be useful in future evaluations of vaccines and immunity against rotavirus infections.