Journal of Microbiology

Journal Article

Prevalence of human Norovirus by genotype in contaminated groundwater in Korea over the last decade (2007–2016): Siwon Lee , Junhyeong Jang , Kyungseon Bae , Wonseok Lee , Hyenmi Chung , Sangjung Park; J. Microbiol. 2018;56(12):926-931. Published online November 27, 2018; DOI: https://doi.org/10.1007/s12275-018-8340-8

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This study investigated the occurrence of human Norovirus (HuNoV) by genotype in 1,486 groundwater samples collected from 843 groundwater wells suspected of contamination during 2007–2016, in South Korea. We identified and genotyped 186 HuNoV sequences in 178 HuNoV-positive samples using the RIVM-NoroNet norovirus genotyping tool (NGT) and phylogenetic tree analysis based on RIVM-NoroNet reference sequences. HuNoV GII was more prevalent than GI. The major genotypes detected were HuNoV GII.4 (43.0%), GII.22 (15.6%), GI.5 (10.2%), and GI.1 (8.6%); several genotypes accounted for < 5.0% of all HuNoVs, including GII.17, GI.6, GI.4, GII.6, GI.8, GII.3, GII.13, GI.3, GI.7, GI.2, GI.9, GII.1, GII.8, and GII.10. The prevalence of HuNoVs and number of genotypes detected has drastically decreased over the last decade. HuNoV GII.17, the emerging genotype worldwide including Europe and Asia, appeared in Korean groundwater from 2010, dominated in 2013–2014, and continued to be observed. HuNoV GII.4, the major type occurred last decade from Korean groundwater except 2013–2014, continued to be detected and prevalent similar to HuNoV GII.17 in 2016.

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Development of diagnostic systems for wide range and highly sensitive detection of two waterborne hepatitis viruses from groundwater using the conventional reverse transcription nested PCR assay
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Research Support, Non-U.S. Gov't

Reliability of Non-Culturable Virus Monitoring by PCR-Based Detection Methods in Environmental Waters Containing Various Concentrations of Target RNA: Eung Seo Koo , Chang-Hoon Yoo , Youjin Na , Soo Young Park , Hey Rhyoung Lyoo , Yong Seok Jeong; J. Microbiol. 2012;50(5):726-734. Published online November 4, 2012; DOI: https://doi.org/10.1007/s12275-012-2279-y

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Abstract: Owing to the lack of practical cell culture system for human noroviruses (HuNoV), various detection methods based on conventional reverse transcription-PCR (RT-PCR) and the quantitative real-time PCR have been major tools for monitoring environmental water safety. In this study, we showed that the proportion of water sample concentrates used for one-step RT-PCR significantly influences false-negative findings of the non-culturable viruses. In total, 59 archived samples of previously analyzed water concentrates were reexamined for HuNoV RNA by the one-step RT-PCR and semi-nested PCR. Using new aliquots for RNA extraction for every trial, up to 20 PCR trials were performed for each archive to determine whether the crosscheck results supported the previous determinations. We reconfirmed that 27.6% (8/29) of the samples were HuNoV-positive samples: 6.7% (1/15) from groundwater, 33.3% (3/9) from river water, and 80% (4/5) from treated sewage effluent (TSE). These results corresponded to the ratio of previously negative HuNoV samples now identified as positive (8/30): 6.7% (1/15) from groundwater, 20% (1/5) from river water, and 60% (6/10) from TSE. To elucidate the cause of these results, 16 different concentrations of murine norovirus (MNV) RNA (from 2×102 to 8×103 copies, divided into 10 tubes for each concentration) were subjected to one-step RT-PCR. The detection frequency and reproducibility decreased sharply when the number of MNV RNA copies fell below threshold levels. These observations suggest that the proportion of water concentrate used for PCR-based detection should be considered carefully when deciding viral presence in certain types of environmental water, particularly in regard with legal controls.

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