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Noroviruses (NoVs) are a major etiological agent of sporadic acute gastroenteritis worldwide.To detect, quantify and characterize genogroups and genotypes of NoVs in children with and without gastrointestinal symptoms.NoVs were investigated by RT-PCR in a total of 319 fecal specimens from children up to three years old with (n=229) and without (n=90) acute diarrhea, between February 2003 and June...