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Distribution of norovirus genotypes and subtypes in river water by ultra-deep sequencing-based analysis.

To determine the distribution of Norovirus (NoV) genotypes in natural river water in Thailand, we conducted a genome analysis using a next-generation sequencer. Twenty-five river water samples were collected at five different sites of the Khlong Klon River in the suburbs of Bangkok between August 2013 and December 2014. The partial genome of NoV was detected in 15 of the 25 samples (60·0%). Seven of these 15 samples (46·7%) contained multiple NoV GII genotypes: GII.4, GII.6, and GII.17. Our data showed that GII.17 had already emerged in August 2013 as a minor population, and it became a major genotype in December 2014. Our findings indicate that the virus was likely to have been circulating in the community before it appeared in the river water.

SIGNIFICANCE AND IMPACT OF THE STUDY: Our study was to investigate the frequencies of multiple genogroups and genotypes of norovirus in the river water near Bangkok, Thailand, by ultra-deep sequencing-based analysis. This study revealed that the epidemic strain was likely to have been circulating in the community before it appeared in the river water. Monitoring of the Norovirus (NoV) genomes in the natural environment may contribute to an understanding of the emergence of new epidemic NoV strains in human populations.

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