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High Similarity of Novel Orthoreovirus Detected in a Child Hospitalized with Acute Gastroenteritis to Mammalian Orthoreoviruses Found in Bats in Europe

A. Steyer, I. Gutierrez-Aguire, M. Kolenc, S. Koren, D. Kutnjak, M. Pokorn, M. Poljšak-Prijatelj, N. Rački, M. Ravnikar, M. Sagadin, A. Fratnik Steyer, N. Toplak

Journal of Clinical Microbiology, November 2013

Mammalian orthoreoviruses (MRV) are known to cause mild enteric and respiratory infections in humans. They are widespread and infect a broad spectrum of mammals. We report here the first case of MRV detected in a child with acute gastroenteritis, which showed the highest similarity to MRV reported recently in European bats. Stool sample examination of the child was negative for most common viral and bacterial pathogens. Reovirus particles were identified by electron microscopic examination of both stool suspension and cell culture supernatant. The whole genome sequence was obtained with the Ion Torrent next generation sequencing platform. Prior to sequencing, stool sample suspension and cell culture supernatant were pre-treated with nucleases and/or the convective interaction media (CIM) monolithic chromatographic method to purify and concentrate the target viral nucleic acid. Whole genome sequence analysis revealed that the Slovenian SI-MRV01 isolate was most similar to MRV found in bat in Germany. High similarity was shared in all genome segments, with nucleotide and amino acid identities between 93.8-99.0% and 98.4-99.7%, respectively. It was shown that CIM monolithic chromatography alone is an efficient method for enriching the sample in viral particles before nucleic acid isolation and next generation sequencing application.

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