Key result
Rotavirus NSP4-specific IgG antibodies peak at 12-23 months before declining, suggesting short-lived immune memory.
Observational (n=401)
No
The short immune memory for NSP4 compared to whole rotavirus structural proteins suggests that a single NSP4 protein may not provide long-term protection as a rotavirus vaccine.
May limit NSP4-based rotavirus vaccine durability; hypothesis-generating for multi-antigen strategies in future trials.
This study aimed to determine the genotypes of NSP4 in children with acute rotavirus diarrhea and evaluate serum antibody titers to NSP4 in different age groups in Shanghai, China. A total of 171 stool specimens were collected from hospitalized patients < or =5 years of age who had acute rotavirus diarrhea between January 2003 and December 2006. Serum samples were collected from healthy individuals, including 200 for 0-60 months of age and 30 for over 5 years of age. NSP4-B type was the single predominant genotype during 2003-2006 in Shanghai. The titers of NSP4 specific IgG antibody increased with age after birth and peaked during 12-23 months of age, thereafter dropping to a level as low as that in the first 5 months of age. However, high levels of antibody against whole rotavirus were maintained in older children over 5 years of age and in adults. Information on prevalence of NSP4 genotypes in this area of China provides useful data for formulating vaccine policy. Short antibody immune memory compared with that induced mainly by rotavirus structural proteins indicated the protective effect against rotavirus may not persist long term if a single NSP4 protein is applied as the rotavirus vaccine.
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Xu et al. (2010) conducted an observational in Acute rotavirus diarrhea (n=401). Age and Rotavirus NSP4 Genotype vs. Different age groups was evaluated on NSP4-specific IgG antibody titers. NSP4-B was the predominant rotavirus genotype in Shanghai, and NSP4-specific IgG antibodies peaked at 12-23 months of age before declining to baseline levels, suggesting short-lived immune memory compared to whole rotavirus antibodies.
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