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Bergallo, Massimiliano; Galliano, Ilaria; Montanari, Paola; Brusin, Martina Rosa; Finotti, Serena; Paderi, Giulia; Gabiano, Clara
Canadian journal of microbiology, 04/2017, Volume: 63, Issue: 4Journal Article
Gastroenteritis is a common disease in children. It is characterized by diarrhea, vomiting, abdominal pain, and fever. Sapovirus (SaV) is a causative agent of acute gastroenteritis, but it causes milder illness than do rotavirus and norovirus. There is high variability in the analytical performance of quantitative PCR-based assays among clinical laboratories. This study developed a reverse transcription real-time PCR method to detect SaV in fecal specimens collected from children under 5-years-old with acute gastroenteritis. Of 137 episodes of acute gastroenteritis, 15 (10.9%) were associated with SaV genomic detection, with a median viral load of 6.6(log 10 ) ± 7.1(log 10 ) genomes/mg fecal specimens. There was a significant difference in detection rate between males and females (9.48% (13/15) vs. 1.46% (2/15), p = 0.0232). Among the 15 SaV-positive cases, 6 were also positive for rotavirus. Viral RNA recovery rate ranged from 46% to 77% in the manual RNAzol protocol and from 31% to 90% in the automated Maxwell protocol. We also studied whether human genomic DNA influences the sensitivity of the assay: its presence caused a decrease in PCR sensitivity. The development of a laboratory-designed real-time PCR TaqMan assay for quantitative detection of SaV and the optimization and standardization of this assay, using stools of children with acute gastroenteritis, are described.
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