Asymptomatic norovirus infections in Nicaraguan children and its association with viral properties and histo-blood group antigens

The Pediatric Infectious Disease Journal
Filemón BucardoLennart Svensson

Abstract

It has been previously reported that histo-blood group antigens (HBGAs) and particularly secretor status provides protection against symptomatic norovirus infection, but it remains unclear to what extent this includes asymptomatic infections in children. To explore whether HBGAs or certain viral genotypes are associated with asymptomatic norovirus infections in a pediatric population in Nicaragua, we investigated 163 children ≤5 years of age, without a recent history of diarrhea (≤10 days). Asymptomatic norovirus infections were observed in 11.7% (19/163), with children ≤6 months of age being most frequently infected (16%). Of the 19 norovirus-positive children, 4 (21%) and 10 (53%) were infected with genogroups GI and GII, respectively, and 4 children (21%) were infected with viruses of both genogroups. Most children had ≥10 viral genomes per gram of feces. Nucleotide sequence analysis (15/19) revealed uncommon genotypes, such as, GII.7 (n = 5) and GII.2 (n = 3). An interesting observation was the low frequency of norovirus GII.4 strains among the asymptomatic children. AB blood type, Lewis a (Le) phenotype and nonsecretor genotype (sese) were not found among the asymptomatic children, but they occurred in population controls....Continue Reading

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Feb 1, 2012·Clinical Infectious Diseases : an Official Publication of the Infectious Diseases Society of America·Faizel H A SukhrieMarion Koopmans
Oct 25, 2012·Emerging Infectious Diseases·Filemón BucardoLennart Svensson
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