Related Experiment Videos
Neutralizing antibody immune response in children with primary and secondary rotavirus infections
C F Arias1, S López, J D Mascarenhas
1Departamento de Biología Molecular, Universidad Nacional Autónoma de México, Cuernavaca, Mexico.
Insights
Brazilian children’s rotavirus infections reveal that the infecting virus strain intrinsically determines the type of immune response. Serotype-specific antibody responses can vary between rotavirus serotypes and strains.
Area of Science:
- Virology
- Immunology
- Pediatrics
Background:
- Rotavirus is a leading cause of severe diarrheal disease in children globally.
- Understanding the immune response to different rotavirus serotypes is crucial for vaccine development and public health strategies.
Purpose of the Study:
- To characterize the neutralizing antibody immune response to six human rotavirus serotypes in Brazilian children.
- To correlate the immune response with the G serotype of the infecting rotavirus strain during primary and secondary infections.
Main Methods:
- Analysis of neutralizing antibody immune responses in 25 Brazilian children with primary and/or secondary rotavirus infections.
- Correlation of immune responses with infecting rotavirus G serotypes (G1-G4, G8, G9).
- RNA electrophoresis to analyze circulating rotavirus strains.
Main Results:
- Primary rotavirus infections elicited both homotypic and heterotypic antibody responses.
- Serotype G1 viruses primarily induced homotypic responses, while G2 and G4 induced homotypic and heterotypic responses, mainly against G1.
- The specificity of the neutralizing antibody response was consistent between primary and secondary infections.
Conclusions:
- The heterotypic immune response to rotavirus is an intrinsic property of the infecting virus strain.
- Serotype-specific seroconversion patterns exist but can vary significantly depending on the rotavirus serotype and specific strain involved.
Abstract:
We have characterized the neutralizing antibody immune response to six human rotavirus serotypes (G1 to G4, G8, and G9) in Brazilian children with primary and secondary rotavirus infections and correlated the response with the G serotype of the infecting rotavirus strain. Twenty-five children were studied: 17 had a single rotavirus infection, 4 were reinfected once, and 4 experienced three infections. Two of the reinfections were by non-group A rotaviruses. Among the 25 primary infections, we observed homotypic as well as heterotypic responses; the serotype G1 viruses, which accounted for 13 of these infections, induced mostly a homotypic response, while infections by serotype G2 and G4 viruses induced, in addition to the homotypic, a heterotypic response directed primarily to serotype G1. Two of the primary infections induced heterotypic antibodies to 69M, a serotype G8 virus that by RNA electrophoresis analysis was found not to circulate in the population during the time of the study. The specificity of the neutralizing antibody immune response induced by a virus of a given serotype was the same in primary as well as secondary infections. These results indicate that the heterotypic immune response induced in a primary rotavirus infection is an intrinsic property of the virus strain, and although there seem to be general patterns of serotype-specific seroconversion, these may vary from serotype to serotype and from strain to strain within a serotype.