title: A new method for estimating the prevalence of clonorchiasis in Korea: A proposal to replace arbitrary riverside sampling.
abstract: South Korea presently uses an arbitrary sampling method to monitor the prevalence of Clonorchis sinensis infection in the endemic areas of the country. However, the present method is not standardized and focuses primarily on individuals who reside nearest to the mainstream river. We propose a new sampling method that combines cluster sampling with proportionate quota sampling to ensure that the entire endemic area is accurately represented. We tested the new method in Okcheon-gun, South Korea, and determined that the C sinensis infection prevalence (8.9%) in 2013 was higher than that (6.9%) estimated in 2012 when the arbitrary method was used. Additionally, no difference was observed in the prevalence based on the distance from the riverside areas, including branches and creeks, between the areas <1 and >1 km away from the riversides. Therefore, health authorities should place equal emphasis on all regions within the endemic areas. Based on the findings, we recommend the following: the clonorchiasis prevalence rate must be measured using probability sampling, (clear guidelines on survey coverage should be provided to include the riverside areas and all areas nearby branch streams, and regional cohorts should be created for continuous monitoring of prevalence rates across the region.
authors.affiliation: Department of Preventive Medicine, Okcheon-gun Public Health Center, Okcheon-gun, Chungcheongbuk-do Public Health Medical Service, Boramae Medical Center, Seoul National University College of Medicine, Seoul Institute of Health Policy and Management, Medical Research Center, Seoul National University, Seoul Division of Malaria and Parasitic Diseases, National Institute of Health, Centers for Disease Control and Prevention, Cheongju, Chungcheongbuk-do Taean-gun Hospitalized Public Health Center, Taeangun, Chungcheongnam-do Seoul National University College of Medicine, Seoul Department of Nursing Science, Shinsung University, Dangjin-si, Chungcheongnam-do, South Korea.
authors.forename: Jin-Young
authors.initials: JY
authors.lastname: Jeong
authors.forename: Jin Yong
authors.initials: JY
authors.lastname: Lee
authors.forename: Byung-Suk
authors.initials: BS
authors.lastname: Chung
authors.forename: Younghyun
authors.initials: Y
authors.lastname: Choi
authors.forename: Allison Baer
authors.initials: AB
authors.lastname: Alley
authors.forename: Hyun Joo
authors.initials: HJ
authors.lastname: Kim
mesh_terms: D000328:Adult; D000368:Aged; D000818:Animals; D003003:Clonorchiasis / Q000453:epidemiology*; D003004:Clonorchis sinensis; D062665:Epidemiological Monitoring; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D015995:Prevalence; D056910:Republic of Korea / Q000453:epidemiology; D055815:Young Adult