Parasites, Hosts and Diseases

"Hyeng-Il Cheun"

Brief Communications

Prevalence of Clonorchis sinensis Infection among Residents along 5 Major Rivers in the Republic of Korea: Young-Il Jeong, Hee-Eun Shin, Sang-Eun Lee, Hyeng-Il Cheun, Jung-Won Ju, Jung-Yeon Kim, Mi Yeoun Park, Shin-Hyeong Cho; Korean J Parasitol 2016;54(2):215-219.
Published online April 30, 2016; DOI: https://doi.org/10.3347/kjp.2016.54.2.215

Abstract
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Clonorchis sinensis is currently the most important parasite affecting public health problems in the Republic of Korea. We investigated the prevalence of C. sinensis infection among residents living along 5 major rivers in Korea. A total of 42,562 individual stool samples were collected from 37 localities and examined using the formalin-ether sedimentation technique. Helminth eggs were detected in 4,052 (9.5%) residents and 3,586 (8.4%) were infected with C. sinensis. The egg positive rate of C. sinensis in Nakdong, Seomjin, Geum, Yeongsan, and Han River was 11.7%, 9.9%, 6.5%, 3.1%, and 1.0%, respectively. The overall prevalence of clonorchiasis by sex was 11.2% in males and 6.2% in females. The age-prevalence was the highest in the 50-59 years band. It has been reconfirmed that the endemicity of clonorchiasis is higher in southern areas of Korea, especially along Nakdong and Seomjin Rivers. A combination of continuous control programs with health education initiatives is urgently required in these highly endemic areas of clonorchiasis in Korea.

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Cryptosporidium hominis Infection Diagnosed by Real-Time PCR-RFLP: Hyeng-Il Cheun, Kyungjin Kim, Sejoung Yoon, Won-Ja Lee, Woo-Yoon Park, Seobo Sim, Jae-Ran Yu; Korean J Parasitol 2013;51(3):353-355.
Published online June 30, 2013; DOI: https://doi.org/10.3347/kjp.2013.51.3.353

Abstract
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There are approximately 20 known species of the genus Cryptosporidium, and among these, 8 infect immunocompetent or immunocompromised humans. C. hominis and C. parvum most commonly infect humans. Differentiating between them is important for evaluating potential sources of infection. We report here the development of a simple and accurate real-time PCR-based restriction fragment length polymorphism (RFLP) method to distinguish between C. parvum and C. hominis. Using the CP2 gene as the target, we found that both Cryptosporidium species yielded 224 bp products. In the subsequent RFLP method using TaqI, 2 bands (99 and 125 bp) specific to C. hominis were detected. Using this method, we detected C. hominis infection in 1 of 21 patients with diarrhea, suggesting that this method could facilitate the detection of C. hominis infections.

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PCR Diagnosis of Entamoeba histolytica Cysts in Stool Samples: Joung-Ho Moon, Shin-Hyeong Cho, Jae-Ran Yu, Won-Ja Lee, Hyeng-Il Cheun; Korean J Parasitol 2011;49(3):281-284.
Published online September 30, 2011; DOI: https://doi.org/10.3347/kjp.2011.49.3.281

Abstract
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Amebiasis is a protozoan disease caused by Entamoeba histolytica and a potential health threat in areas where sanitation and hygiene are inappropriate. Highly sensitive PCR methods for detection of E. histolytica in clinical and environmental samples are extremely useful to control amebiasis and to promote public health. The present study compared several primer sets for small subunit (SSU) rDNA and histone genes of E. histolytica cysts. A 246 bp of the SSU rDNA gene of pure cysts contained in phosphate-buffered saline (PBS) and in stool samples was successfully amplified by nested PCR, using the 1,147-246 bp primer set, of the primary PCR products which were pre-amplified using the 1,147 bp primer as the template. The detection limit of the nested PCR using the 1,147-246 primer set was 10 cysts in both groups (PBS and stool samples). The PCR to detect histone gene showed negative results. We propose that the nested PCR technique to detect SSU rDNA can be used as a highly sensitive genetic method to detect E. histolytica cysts in stool samples.

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Original Articles

Seasonal Prevalence of Mosquitoes, Including Vectors of Brugian Filariasis, in Southern Islands of the Republic of Korea: Hyeng-Il Cheun, Shin-Hyeong Cho, Hee-Il Lee, E-Hyun Shin, Jong-Soo Lee, Tong-Soo Kim, Won-Ja Lee; Korean J Parasitol 2011;49(1):59-64.
Published online March 18, 2011; DOI: https://doi.org/10.3347/kjp.2011.49.1.59

Abstract
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A survey of mosquitoes, including the vector status of Brugia malayi filariasis and their relative larval density, was conducted from 2002 to 2005 at several southern remote islands of Jeollanam-do (province), Gyeongsangnam-do, and Jeju-do, Korea, where filariasis was previously endemic. Overall, a total of 9 species belonging to 7 genera were collected. Ochlerotatus togoi (formerly known as Aedes togoi), Anopheles (Hyrcanus) group, and Culex pipiens were the predominant species captured at all areas. Oc. togoi larvae were most frequently collected at salinity levels <0.5% during June and July, with densities decreasing sharply during the rainy season in August. The most likely explanation for the eradication of filariasis in these areas is suggested to be an aggressive treatment program executed during the 1970s and the 1990s. However, high prevalence of the vector mosquitoes may constitute a potential risk for reemerging of brugian filariasis in these areas.

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Shin Hyeong Cho, Da Won Ma, Bo Ra Koo, Hee Eun Shin, Wook Kyo Lee, Byong Suk Jeong, Chaeshin Chu, Won Ja Lee, Hyeng Il Cheun
Osong Public Health and Research Perspectives.2012; 3(3): 145. CrossRef

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Infection Status of Hospitalized Diarrheal Patients with Gastrointestinal Protozoa, Bacteria, and Viruses in the Republic of Korea: Hyeng-Il Cheun, Shin-Hyeong Cho, Jin-Hee Lee, Yi-Young Lim, Ji-Hye Jeon, Jae-Ran Yu, Tong-Soo Kim, Won-Ja Lee, Seung-Hak Cho, Deog-Yong Lee, Mi-Seon Park, Hye-Sook Jeong, Doo-Sung Chen, Yeong-Mi Ji, Mi-Hwa Kwon; Korean J Parasitol 2010;48(2):113-120.
Published online June 17, 2010; DOI: https://doi.org/10.3347/kjp.2010.48.2.113

Abstract
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To understand protozoan, viral, and bacterial infections in diarrheal patients, we analyzed positivity and mixed-infection status with 3 protozoans, 4 viruses, and 10 bacteria in hospitalized diarrheal patients during 2004-2006 in the Republic of Korea. A total of 76,652 stool samples were collected from 96 hospitals across the nation. The positivity for protozoa, viruses, and bacteria was 129, 1,759, and 1,797 per 10,000 persons, respectively. Especially, Cryptosporidium parvum was highly mixed-infected with rotavirus among pediatric diarrheal patients (29.5 per 100 C. parvum positive cases), and Entamoeba histolytica was mixed-infected with Clostridium perfringens (10.3 per 100 E. histolytica positive cases) in protozoan-diarrheal patients. Those infected with rotavirus and C. perfringens constituted relatively high proportions among mixed infection cases from January to April. The positivity for rotavirus among viral infection for those aged ≤ 5 years was significantly higher, while C. perfringens among bacterial infection was higher for ≥ 50 years. The information for association of viral and bacterial infections with enteropathogenic protozoa in diarrheal patients may contribute to improvement of care for diarrhea as well as development of control strategies for diarrheal diseases in Korea.

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Successful Control of Lymphatic Filariasis in the Republic of Korea: Hyeng-Il Cheun, Yoon Kong, Shin-Hyeong Cho, Jong-Soo Lee, Jong-Yil Chai, Joo-Shil Lee, Jong-Koo Lee, Tong-Soo Kim; Korean J Parasitol 2009;47(4):323-335.
Published online December 1, 2009; DOI: https://doi.org/10.3347/kjp.2009.47.4.323

Abstract
PDF

A successful experience of lymphatic filariasis control in the Republic of Korea is briefly reviewed. Filariasis in the Republic of Korea was exclusively caused by infection with Brugia malayi. Over the past several decades from the 1950s to 2006, many investigators exerted their efforts to detection, treatment, and follow-up of filariasis patients in endemic areas, and to control filariasis. Mass, combined with selective, treatments with diethylcarbamazine to microfilaria positive persons had been made them free from microfilaremia and contributed to significant decrease of the microfilarial density in previously endemic areas. Significant decrease of microfilaria positive cases in an area influenced eventually to the endemicity of filariasis in the relevant locality. Together with remarkable economic growth followed by improvement of environmental and personal hygiene and living standards, the factors stated above have contributed to blocking the transmission cycle of B. malayi and led to disappearance of this mosquito-borne ancient disease in the Republic of Korea.

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