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Genotypes of Blastocystis sp. among elderly health checkup people in South Korea with a questionnaire on risk factors

 Taehee Chang  ;  Bong-Kwang Jung  ;  Hyejoo Shin  ;  Sooji Hong  ;  Seungwan Ryoo  ;  Jeonggyu Lee  ;  Seihee Han  ;  Sun Min Park  ;  Min-Suk Rhee  ;  Heejin Kimm  ;  Sun Ha Jee  ;  Jong-Yil Chai 
 PARASITOLOGY RESEARCH, Vol.120(9) : 3297-3306, 2021-09 
Journal Title
Issue Date
Aged ; Aged, 80 and over ; Blastocystis Infections* / epidemiology ; Blastocystis* / genetics ; Cross-Sectional Studies ; Feces ; Female ; Genotype ; Humans ; Male ; Middle Aged ; Phylogeny ; Prevalence ; Republic of Korea / epidemiology ; Risk Factors ; Surveys and Questionnaires
Blastocystis sp. ; Molecular subtyping ; Risk factor ; South Korea
Blastocystis sp. is a common zoonotic intestinal parasite of humans and animals, and has been classified into at least 17 distinct subtypes. Despite its potential impact on public health, the prevalence and subtype distribution of Blastocystis sp. have seldom been the study subject in South Korea. To determine the prevalence and subtype distribution of Blastocystis sp. and to obtain information on risk factors, we performed a cross-sectional study targeting elderly health checkup people, who visited Seoul Western Branch of the Korea Association of Health Promotion (KAHP) in October 2019. Stool samples were collected from 293 participants consisting of 128 males and 165 females with a mean age of 64.7 years (from 50 to 88 years) with a questionnaire on potential risk factors. All the samples were tested by PCR targeting the SSU rRNA gene of Blastocystis sp., and nucleotide sequences of positive samples were used to identify the subtypes. The overall prevalence of Blastocystis sp. was 9.2% (27/293). Among the positive samples, subtype 3 was predominant (59%; 16/27), followed by subtype 1 (41%; 11/27). No other subtypes were detected. In the univariable analysis, the age, sex, presence of digestive symptoms, source of drinking water, and history of drug intake were not significantly associated with Blastocystis sp. infection. Two parameters, including the Enterococcus hirae bacterial infection and the frequency of intake of cooked or boiled vegetables less than twice a week, showed statistical significance. However, the multivariable regression analysis revealed that only the latter parameter was statistically significant. The results suggested that subtypes 3 and 1 are the 2 major genotypes of Blastocystis sp. among elderly people in South Korea, and low frequency of consuming cooked or boiled vegetables is a potential risk factor.
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4. Graduate School of Public Health (보건대학원) > Graduate School of Public Health (보건대학원) > 1. Journal Papers
Yonsei Authors
Kimm, Heejin(김희진) ORCID logo https://orcid.org/0000-0003-4526-0570
Jee, Sun Ha(지선하) ORCID logo https://orcid.org/0000-0001-9519-3068
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