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Neutralizing Antibodies to Heterologous Animal Rotavirus Serotypes 5, 6, 7, and 10 in Sera from Ecuadorian Children

Overview
Specialty Microbiology
Date 1991 May 1
PMID 1647406
Citations 10
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Abstract

Serum samples from 870 Ecuadorian children who underwent natural rotavirus exposure were tested for neutralizing serum antibody to heterologous animal rotavirus (RV) serotypes. Six percent of the sera neutralized porcine RV OSU (serotype 5), 10% neutralized bovine RV NCDV (serotype 6), 4% neutralized avian RV Ch-2 (serotype 7), and 8% neutralized bovine RV V1005 (serotype 10). Neutralization was defined as a 90% reduction in infectious virus at a 1:100 serum dilution. The prevalence of antibody to all four heterotypic viruses increased with the age of the children and the number of human RV serotypes neutralized, but prevalences did not differ significantly between children from rural and urban areas of Ecuador. No serum sample that specifically neutralized bovine RV NCDV was identified. We inferred from the seroepidemiological analysis that human RVs contain immunorecessive neutralization epitopes that can stimulate cross-neutralizing antibody to heterotypic animal RVs. This occurs increasingly with age and with the number of human serotypes recognized by a child's neutralizing antibody. Thus, it appears that a broadened immune response to the heterotypic strains occurs with repetitive RV infections.

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