Molecular epidemiology of norovirus in asymptomatic food handlers in Busan, Korea, and emergence of genotype GII.17

Hee Soo Koo; Mi Ok Lee; Pyeong Tae Ku; Su Jeong Hwang; Dong Ju Park; Hyung Suk Baik

doi:10.1007/s12275-016-6312-4

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Molecular epidemiology of norovirus in asymptomatic food handlers in Busan, Korea, and emergence of genotype GII.17: Hee Soo Koo ¹, Mi Ok Lee ¹, Pyeong Tae Ku ¹, Su Jeong Hwang ¹, Dong Ju Park ¹, Hyung Suk Baik ²; Journal of Microbiology 2016;54(10):686-694.
DOI: https://doi.org/10.1007/s12275-016-6312-4
Published online: September 30, 2016

¹Busan Metropolitan Government Research Institute of Health and Environment, Busan 46616, Republic of Korea, ²Department of Microbiology, Pusan National University, Busan 46241, Republic of Korea¹Busan Metropolitan Government Research Institute of Health and Environment, Busan 46616, Republic of Korea, ²Department of Microbiology, Pusan National University, Busan 46241, Republic of Korea

Corresponding author: Hyung Suk Baik , Tel: -,

Received: 1 July 2016 • Revised: 23 August 2016 • Accepted: 25 August 2016

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Abstract

The molecular epidemiology of norovirus infections was studied in food handlers without any symptoms from January to December 2015 in Busan city, Korea. A total of 2,174 fecal specimens from asymptomatic food handlers were analyzed, and 2.3% (49/2,174) were norovirus-positive. Fourteen of 335 samples (4.2%) were positive in January; fifteen of 299 samples (5.0%) in February, and seven of 189 samples (3.7%) in December. However, norovirus was rarely detected in other months. From sequencing analysis, 11 genotypes (five GI and six GII genotypes) were detected. Among the 42 capid gene sequences identified, 14 were from the GI genogroup, while 28 were from the GII genogroup. The most commonly detected genotype was GII.17, comprising 15 (35.7%) of positive samples. From January 2012 to December 2015, 5,138 samples were collected from gastroenteritis patients and outbreaks in Busan. The most detected genotype in 2012, 2013, and 2014 was GII.4 (121, 24, and 12 cases, respectively), but in 2015, GII.17 (25 cases) was the most common. The GII.4 genotype was the major cause of acute gastroenteritis from 2012 to 2014, but the GII.17 genotype became the most prevalent cause in 2015. Continued epidemiological surveillance of GII.17 is needed, together with assessment of the risk of norovirus infection.

Keywords: norovirus;food handler;asymptomatic;molecular genetics

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Molecular epidemiology of norovirus in asymptomatic food handlers in Busan, Korea, and emergence of genotype GII.17

J. Microbiol. 2016;54(10):686-694. Published online September 30, 2016

DOI: https://doi.org/10.1007/s12275-016-6312-4

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