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Eom KS, Rim HJ, Jeon HK. Taenia asiatica: Historical overview of taeniasis and cysticercosis with molecular characterization. ADVANCES IN PARASITOLOGY 2020; 108:133-173. [PMID: 32291084 DOI: 10.1016/bs.apar.2019.12.004] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Asian Taenia is a human-infecting Taenia tapeworm known as Taenia asiatica following morphological examination of adult and larval stages of the tapeworm by Eom and Rim (1993). The life cycle of T. asiatica differs from that of T. saginata in its intermediate host (pigs versus cattle) as well as in the infected organs (liver versus muscle). T. asiatica can be differentiated from T. solium and T. saginata by examination of morphological characteristics such as the scolex, mature and gravid proglottids in the adult stage, and the scolex and bladder surface in the larval stage. T. asiatica has been identified in Korea, Taiwan, the Philippines, China, Thailand, Indonesia, Vietnam, Japan, Lao PDR, Nepal and India. The molecular tools employed for T. asiatica identification have been developed to differentiate T. asiatica from other human-infecting Taenia tapeworms based on genetic information such as nucleotide sequence of mitochondrial genes, nuclear ribosomal genes and nuclear genes that lead to development of the subsequent molecular techniques, such as PCR-RFLP, PCR-RAPD, BESST-base, LAMP and qPCR. Investigation of the phylogenetic relationships among human Taenia species revealed that T. asiatica is a sister species with T. saginata, which is genetically more similar than other Taenia species in terms of the nucleotide sequences of cox1, nad1 and 28S rDNA. The mitochondrial genomes of human Taenia tapeworms comprise 13,703bp (T. asiatica), 13,670bp (T. saginata) and 13,709bp (T. solium), and contain 36 genes including 12 protein-coding genes, 2 ribosomal RNAs (rRNAs, a small and a large subunit), and 22 transfer RNAs (tRNAs). Sequence differences in the full genome of T. asiatica and T. saginata mitochondria is 4.6%, while T. solium differs by 11%. Hox gene orthology in T. asiatica was established by comparative analysis with Platyhelminthes Hox genes. T. asiatica Hox revealed six Hox orthologs including two lab/Hox1, two Hox3, one Dfd/Hox4 and one Lox/Lox4. Hybridization between T. asiatica and T. saginata was definitely observed in these species which are sympatrically endemic in the regions of Korea, Thailand, China and Lao PDR. Comparative analyses of T. asiatica, T. saginata and T. solium genomes were also reported with genome features. Taenia asiaticus nomen novum was proposed for T. asiaticaEom and Rim, 1993 which is a homonym of T. asiatica Linstow, 1901 (Davaineidae).
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Affiliation(s)
- Keeseon S Eom
- Department of Parasitology, Parasite Research Center and Parasite Resource Bank, Chungbuk National University School of Medicine, Cheongju, South Korea.
| | - Han-Jong Rim
- Department of Parasitology, Korea University College of Medicine, Seoul, South Korea
| | - Hyeong-Kyu Jeon
- Department of Parasitology, Parasite Research Center and Parasite Resource Bank, Chungbuk National University School of Medicine, Cheongju, South Korea
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Song SM, Yun HS, VanBik D, Chang HH, Lee SA, Kim SW, Ryoo N, Eun DY, Lee NY, Goo YK, Hong Y, Ock M, Cha HJ, Chung DI. Ten Cases of Taenia saginata Infection Confirmed by Analysis of the Internal Transcribed Spacer 1 rDNA Region in the Republic of Korea. THE KOREAN JOURNAL OF PARASITOLOGY 2019; 57:417-422. [PMID: 31533409 PMCID: PMC6753295 DOI: 10.3347/kjp.2019.57.4.417] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/14/2019] [Accepted: 06/15/2019] [Indexed: 11/24/2022]
Abstract
From October 2015 to August 2018, tapeworm proglottids were obtained from 10 patients who were residents of Daegu and Gyeongbuk provinces and had a history of raw beef consumption. Most of them had no overseas travel experience. The gravid proglottids obtained from the 10 cases had 15–20 lateral uterine branches. A part of internal transcribed spacer 1 (ITS1) DNA of the 10 cases, amplified by polymerase chain reaction (PCR) and digested with AleI restriction enzyme, produced the same band pattern of Taenia saginata, which differentiated from T. asiatica and T. solium. Sequences of ITS1 and cytochrome c oxidase subunit 1 (cox1) showed higher homology to T. saginata than to T. asiatica and T. solium. Collectively, these 10 cases were identified as T. saginata human infections. As taeniasis is one of the important parasitic diseases in humans, it is necessary to maintain hygienic conditions during livestock farming to avoid public health concerns.
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Affiliation(s)
- Su-Min Song
- Department of Parasitology and Tropical Medicine, School of Medicine, Kyungpook National University, Daegu 41944, Korea.,Department of Parasitology and Genetics, Kosin University College of Medicine, Busan 49267, Korea
| | - Hae Soo Yun
- Department of Parasitology and Tropical Medicine, School of Medicine, Kyungpook National University, Daegu 41944, Korea
| | - Dorene VanBik
- Department of Parasitology and Tropical Medicine, School of Medicine, Kyungpook National University, Daegu 41944, Korea
| | - Hyun-Ha Chang
- Department of Internal Medicine, School of Medicine, Kyungpook National University, Daegu 41944, Korea
| | - Sang-Ah Lee
- Department of Internal Medicine, School of Medicine, Kyungpook National University, Daegu 41944, Korea
| | - Shin-Woo Kim
- Department of Internal Medicine, School of Medicine, Kyungpook National University, Daegu 41944, Korea
| | - Namhee Ryoo
- Department of Laboratory Medicine Keimyung University School of Medicine, Dongsan Medical Center, Daegu 41931, Korea
| | - Dong Yeub Eun
- Dr. Eun's Internal Medicine Clinic, Daegu 42688, Korea
| | - Nan Young Lee
- Sangju Red Cross Hospital, Department of laboratory Medicine, Daegu 37199, Korea
| | - Youn-Kyoung Goo
- Department of Parasitology and Tropical Medicine, School of Medicine, Kyungpook National University, Daegu 41944, Korea
| | - Yeonchul Hong
- Department of Parasitology and Tropical Medicine, School of Medicine, Kyungpook National University, Daegu 41944, Korea
| | - Meesun Ock
- Department of Parasitology and Genetics, Kosin University College of Medicine, Busan 49267, Korea
| | - Hee-Jae Cha
- Department of Parasitology and Genetics, Kosin University College of Medicine, Busan 49267, Korea
| | - Dong-Il Chung
- Department of Parasitology and Tropical Medicine, School of Medicine, Kyungpook National University, Daegu 41944, Korea
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Won EJ, Shin JH, Lee YJ, Kim MJ, Kang SJ, Jung SI, Kim SH, Shin JH, Chai JY, Shin SS. Four Taeniasis saginata Cases Diagnosed at a University Hospital in Korea. THE KOREAN JOURNAL OF PARASITOLOGY 2019; 57:313-318. [PMID: 31284357 PMCID: PMC6616169 DOI: 10.3347/kjp.2019.57.3.313] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/12/2019] [Accepted: 05/23/2019] [Indexed: 11/23/2022]
Abstract
In recent years, the taeniasis has been rarely reported in the Republic of Korea (Korea). But in this study, we intend to report 4 taeniasis cases caused by Taenia saginata during a 5-month period (February to June 2018) at a unversity hospital in Gwangju, Korea. Worm samples (proglottids) discharged from all cases were identified by phenotypic and molecular diagnostics. Mitochondrial cytochrome c oxidase subunit I sequences showed 99.4–99.9% identity with T. saginata but, differed by 4% from T. asiatica and by 7% from T. multiceps, respectively. We found that tapeworms in 2 cases (Cases 2 and 3) yielded exactly the same sequences between them, which differed from those in Cases 1 and 4, suggesting intra-species variation in tapeworms. These taeniasis cases by T. saginata infection in this study, which occurred within a limited time period and region, suggest the possibility of a mini-outbreak. This study highlights the need for further epidemiological investigation of potentially overlooked cases of T. saginata infection in Korea.
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Affiliation(s)
- Eun Jeong Won
- Department of Parasitology and Tropical Medicine, Chonnam National University Medical School, Gwangju 61469, Korea
| | - Ju Hyeon Shin
- Department of Laboratory Medicine, Chonnam National University Hospital, Gwangju 61469, Korea
| | - Yu Jeong Lee
- Department of Parasitology and Tropical Medicine, Chonnam National University Medical School, Gwangju 61469, Korea
| | - Moon-Ju Kim
- Department of Parasitology and Tropical Medicine, Chonnam National University Medical School, Gwangju 61469, Korea
| | - Seung Ji Kang
- Department of Infectious Diseases, Chonnam National University Medical School, Gwangju 61469, Korea
| | - Sook In Jung
- Department of Infectious Diseases, Chonnam National University Medical School, Gwangju 61469, Korea
| | - Soo Hyun Kim
- Department of Laboratory Medicine, Chonnam National University Hospital, Gwangju 61469, Korea
| | - Jong Hee Shin
- Department of Laboratory Medicine, Chonnam National University Hospital, Gwangju 61469, Korea
| | - Jong-Yil Chai
- Korea Association of Health Promotion, Seoul 07549, and Department of Parasitology and Tropical Medicine, Seoul National University College of Medicine, Seoul 03080, Korea
| | - Sung-Shik Shin
- Department of Parasitology, College of Veterinary Medicine, Chonnam National University, Gwangju 61186, Korea
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Shin DH, Chai JY, Hong JH, Seo M. Historical Details about the Meat Consumption and Taeniases in Joseon Period of Korea. THE KOREAN JOURNAL OF PARASITOLOGY 2017; 55:457-460. [PMID: 28877581 PMCID: PMC5594726 DOI: 10.3347/kjp.2017.55.4.457] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 05/11/2017] [Revised: 07/17/2017] [Accepted: 07/19/2017] [Indexed: 11/29/2022]
Abstract
Previous paleoparasitological studies of Joseon specimens established that the prevalence of Taenia infection was not much different from that of the early 20th century Korean population. As many of taeniases originally diagnosed as Taenia saginata in South Korea were revealed to be actually Taenia asiatica, which share a common intermediate host with T. solium (the pig), Joseon people must have ingested raw pork frequently. However, the current examination of extant Joseon documents revealed that the population ate significant amounts of beef even if the beef ban was enforced; and pork was not consumed as much as we thought. Considering the meat consumption pattern at that time, Joseon people should have been infected by T. saginata more frequently than T. asiatica. This may suggest a low prevalence of T. saginata metacestodes in cattle compared to that of T. asiatica metacestodes in pigs, possibly due to the traditional way of rearing pigs (using human feces). This letter gives us a chance to reconsider the existing preconception about parasitic infections in Korean history though we are still hard to accurately estimate the historical patterns of taeniases at this stage.
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Affiliation(s)
- Dong Hoon Shin
- Laboratory of Bioanthropology, Paleopathology and History of Dieseases, Institute of Forensic Science/Department of Anatomy, Seoul National University College of Medicine, Seoul 03080, Korea
| | - Jong-Yil Chai
- Institute of Parasitic Diseases, Korea Association of Health Promotion, Seoul 07649, Korea.,Department of Parasitology and Tropical Medicine, Seoul National University College of Medicine, Seoul 03080, Korea
| | - Jong Ha Hong
- Laboratory of Bioanthropology, Paleopathology and History of Dieseases, Institute of Forensic Science/Department of Anatomy, Seoul National University College of Medicine, Seoul 03080, Korea
| | - Min Seo
- Department of Parasitology, Dankook University College of Medicine, Cheonan 31116, Korea
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Kim HU, Chung YB. A Case of Taenia asiatica Infection Diagnosed by Colonoscopy. THE KOREAN JOURNAL OF PARASITOLOGY 2017; 55:65-69. [PMID: 28285508 PMCID: PMC5365257 DOI: 10.3347/kjp.2017.55.1.65] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/05/2016] [Revised: 12/23/2016] [Accepted: 12/27/2016] [Indexed: 11/23/2022]
Abstract
A case of Taenia asiatica infection detected by small bowel series and colonoscopy is described. The patient was a 42-year-old Korean man accompanied by discharge of movable proglottids via anus. He used to eat raw pig liver but seldom ate beef. Small bowel series radiologic examinations showed flat tape-like filling defects on the ileum. By colonoscopy, a moving flat tapeworm was observed from the terminal ileum to the ascending colon. The tapeworm was identified as T. asiatica by mitochondrial DNA sequencing. The patient was prescribed with a single oral dose (16 mg/kg) of praziquantel.
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Affiliation(s)
- Heung Up Kim
- Department of Internal Medicine, Jeju National University School of Medicine, Jeju 63241, Korea
| | - Young-Bae Chung
- Department of Parasitology, Jeju National University School of Medicine, Jeju 63241, Korea
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Garcia HH, Rodriguez S, Friedland JS. Immunology of Taenia solium taeniasis and human cysticercosis. Parasite Immunol 2014; 36:388-96. [PMID: 24962350 DOI: 10.1111/pim.12126] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2013] [Accepted: 06/18/2014] [Indexed: 01/08/2023]
Abstract
The life cycle of Taenia solium, the pork tapeworm, is continuously closed in many rural settings in developing countries when free roaming pigs ingest human stools containing T. solium eggs and develop cysticercosis, and humans ingest pork infected with cystic larvae and develop intestinal taeniasis, or may also accidentally acquire cysticercosis by faecal-oral contamination. Cysticercosis of the human nervous system, neurocysticercosis, is a major cause of seizures and other neurological morbidity in most of the world. The dynamics of exposure, infection and disease as well as the location of parasites result in a complex interaction which involves immune evasion mechanisms and involutive or progressive disease along time. Moreover, existing data are limited by the relative lack of animal models. This manuscript revises the available information on the immunology of human taeniasis and cysticercosis.
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Affiliation(s)
- H H Garcia
- Department of Microbiology, School of Sciences and Center for Global Health - Tumbes, Universidad Peruana Cayetano Heredia, Lima, Peru; Cysticercosis Unit, Instituto Nacional de Ciencias Neurologicas, Lima, Peru
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7
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Helminths in Meat. Food Microbiol 2014. [DOI: 10.1128/9781555818463.ch26] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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8
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Cho J, Jung BK, Lim H, Kim MJ, Yooyen T, Lee D, Eom KS, Shin EH, Chai JY. Four cases of Taenia saginata infection with an analysis of COX1 gene. THE KOREAN JOURNAL OF PARASITOLOGY 2014; 52:79-83. [PMID: 24623887 PMCID: PMC3948999 DOI: 10.3347/kjp.2014.52.1.79] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/04/2013] [Revised: 12/09/2013] [Accepted: 12/11/2013] [Indexed: 11/23/2022]
Abstract
Human taeniases had been not uncommon in the Republic of Korea (=Korea) until the 1980s. The prevalence decreased and a national survey in 2004 revealed no Taenia egg positive cases. However, a subsequent national survey in 2012 showed 0.04% (10 cases) prevalence of Taenia spp. eggs suggesting its resurgence in Korea. We recently encountered 4 cases of Taenia saginata infection who had symptoms of taeniasis that included discharge of proglottids. We obtained several proglottids from each case. Because the morphological features of T. saginata are almost indistinguishable from those of Taenia asiatica, molecular analyses using the PCR-RFLP and DNA sequencing of the cytochrome c oxidase subunit 1 (cox1) were performed to identify the species. The PCR-RFLP patterns of all of the 4 specimens were consistent with T. saginata, and the cox1 gene sequence showed 99.8-100% identity with that of T. saginata reported previously from Korea, Japan, China, and Cambodia. All of the 4 patients had the history of travel abroad but its relation with contracting taeniasis was unclear. Our findings may suggest resurgence of T. saginata infection among people in Korea.
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Affiliation(s)
- Jaeeun Cho
- Department of Parasitology and Tropical Medicine, Seoul National University College of Medicine, Seoul 110-799, Korea
| | - Bong-Kwang Jung
- Department of Parasitology and Tropical Medicine, Seoul National University College of Medicine, Seoul 110-799, Korea
| | - Hyemi Lim
- Department of Parasitology and Tropical Medicine, Seoul National University College of Medicine, Seoul 110-799, Korea
| | - Min-Jae Kim
- Department of Parasitology and Tropical Medicine, Seoul National University College of Medicine, Seoul 110-799, Korea. ; Department of Internal Medicine, Seoul National University College of Medicine, Seoul 110-799, Korea
| | - Thanapon Yooyen
- Department of Biology, Faculty of Science, Thaksin University, Phatthalung 93110, Thailand
| | - Dongmin Lee
- Department of Parasitology, Medical Research Institute and Parasite Resource Bank, Chungbuk National University School of Medicine, Cheongju 361-763, Korea
| | - Keeseon S Eom
- Department of Parasitology, Medical Research Institute and Parasite Resource Bank, Chungbuk National University School of Medicine, Cheongju 361-763, Korea
| | - Eun-Hee Shin
- Department of Parasitology and Tropical Medicine, Seoul National University College of Medicine, Seoul 110-799, Korea. ; Seoul National University Bundang Hospital, Seongnam 463-707, Korea
| | - Jong-Yil Chai
- Department of Parasitology and Tropical Medicine, Seoul National University College of Medicine, Seoul 110-799, Korea
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Evolution, molecular epidemiology and perspectives on the research of taeniid parasites with special emphasis on Taenia solium. INFECTION GENETICS AND EVOLUTION 2014; 23:150-60. [PMID: 24560729 DOI: 10.1016/j.meegid.2014.02.005] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/31/2013] [Revised: 02/09/2014] [Accepted: 02/11/2014] [Indexed: 11/20/2022]
Abstract
Human cysticercosis is known since old historical times in Greece and China; however, human infections by tapeworms have accompanied human beings for more that hundred thousand years. The disease is tightly bound to poverty and lack of hygiene, and has been eradicated in developed countries, but continues being a public health problem in developing countries of Latin-American, Sub-Saharan Africa and Asia, and is also remerging in a number of non endemic countries. It is considered a neglected disease. Here we revise a number of key scientific contributions on taeniid biology that open new avenues for more effective approaches to the control of cysticercosis. The evolution of flatworms and class Cestoda is analyzed, with special emphasis on the emergence of taeniid parasites and the colonization of the human species by tapeworms. The complex molecular host-parasite interplay in this relationship as result of co-evolution between two distantly related organisms. The relevant host and parasite's factors, in the prospect of identifying species-specific molecular markers useful in epidemiological studies carried out in endemic countries. The new possibilities arising with the characterization of the genomes for several species of tapeworms, including a deeper understanding of these organisms, as well as improved tools for diagnosis, vaccination and drug treatment. The need to revise the current control and management strategies for this tropical neglected disease.
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Ale A, Victor B, Praet N, Gabriël S, Speybroeck N, Dorny P, Devleesschauwer B. Epidemiology and genetic diversity of Taenia asiatica: a systematic review. Parasit Vectors 2014; 7:45. [PMID: 24450957 PMCID: PMC3900737 DOI: 10.1186/1756-3305-7-45] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2013] [Accepted: 01/08/2014] [Indexed: 11/10/2022] Open
Abstract
Taenia asiatica has made a remarkable journey through the scientific literature of the past 50 years, starting with the paradoxical observation of high prevalences of T. saginata-like tapeworms in non-beef consuming populations, to the full description of its mitochondrial genome. Experimental studies conducted in the 1980s and 1990s have made it clear that the life cycle of T. asiatica is comparable to that of T. saginata, except for pigs being the preferential intermediate host and liver the preferential location of the cysts. Whether or not T. asiatica can cause human cysticercosis, as is the case for Taenia solium, remains unclear. Given the specific conditions needed to complete its life cycle, in particular the consumption of raw or poorly cooked pig liver, the transmission of T. asiatica shows an important ethno-geographical association. So far, T. asiatica has been identified in Taiwan, South Korea, Indonesia, the Philippines, Thailand, south-central China, Vietnam, Japan and Nepal. Especially this last observation indicates that its distribution is not restricted to South-East-Asia, as was thought so far. Indeed, the molecular tools developed over the last 20 years have made it increasingly possible to differentiate T. asiatica from other taeniids. Such tools also indicated that T. asiatica is related more closely to T. saginata than to T. solium, feeding the debate on its taxonomic status as a separate species versus a subspecies of T. saginata. Furthermore, the genetic diversity within T. asiatica appears to be very minimal, indicating that this parasite may be on the verge of extinction. However, recent studies have identified potential hybrids between T. asiatica and T. saginata, reopening the debate on the genetic diversity of T. asiatica and its status as a separate species.
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Affiliation(s)
| | | | | | | | | | | | - Brecht Devleesschauwer
- Institute of Health and Society (IRSS), Université catholique de Louvain, Brussels, Belgium.
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Galán-Puchades MT, Fuentes MV. Taenia asiatica: left out by globalisation? Trends Parasitol 2013; 30:54-5. [PMID: 24380665 DOI: 10.1016/j.pt.2013.12.002] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2013] [Accepted: 12/02/2013] [Indexed: 11/16/2022]
Affiliation(s)
- María Teresa Galán-Puchades
- Department of Parasitology, Faculty of Pharmacy, University of Valencia, Av Vicent Andrés Estellés s/n, 46100 Burjassot, Valencia, Spain.
| | - Màrius V Fuentes
- Department of Parasitology, Faculty of Pharmacy, University of Valencia, Av Vicent Andrés Estellés s/n, 46100 Burjassot, Valencia, Spain
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12
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Flisser A. State of the art of Taenia solium as compared to Taenia asiatica. THE KOREAN JOURNAL OF PARASITOLOGY 2013; 51:43-9. [PMID: 23467388 PMCID: PMC3587748 DOI: 10.3347/kjp.2013.51.1.43] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/17/2012] [Revised: 12/18/2012] [Accepted: 12/18/2012] [Indexed: 12/02/2022]
Abstract
Three species of tapeworms infect humans in their adult stage (Taenia solium, Taenia saginata and Taenia asiatica). The 3 are flat, opaque white or yellowish, and exceptional long segmented parasites, measuring 1 to 12 m in their adult stage. In this review, the development of the knowledge regarding the first species, mainly focused on understanding how the larval stage or cysticercus is transmitted to humans, is described. The second species is a cosmopolitan parasite that only causes taeniosis and not cysticercosis; therefore, it will not be included. Information on the third species, which is presently being produced, since this species was recognized as such only at the end of the 20th century, will be discussed at the end of this review.
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Affiliation(s)
- Ana Flisser
- Departamento de Microbiología y Parasitología, Facultad de Medicina, Universidad Nacional Autónoma de México, México 04510 DF, México.
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Jeon HK, Eom KS. Molecular approaches to Taenia asiatica. THE KOREAN JOURNAL OF PARASITOLOGY 2013; 51:1-8. [PMID: 23467738 PMCID: PMC3587737 DOI: 10.3347/kjp.2013.51.1.1] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/18/2012] [Revised: 12/27/2012] [Accepted: 12/27/2012] [Indexed: 11/25/2022]
Abstract
Taenia solium, T. saginata, and T. asiatica are taeniid tapeworms that cause taeniasis in humans and cysticercosis in intermediate host animals. Taeniases remain an important public health concerns in the world. Molecular diagnostic methods using PCR assays have been developed for rapid and accurate detection of human infecting taeniid tapeworms, including the use of sequence-specific DNA probes, PCR-RFLP, and multiplex PCR. More recently, DNA diagnosis using PCR based on histopathological specimens such as 10% formalin-fixed paraffin-embedded and stained sections mounted on slides has been applied to cestode infections. The mitochondrial gene sequence is believed to be a very useful molecular marker for not only studying evolutionary relationships among distantly related taxa, but also for investigating the phylo-biogeography of closely related species. The complete sequence of the human Taenia tapeworms mitochondrial genomes were determined, and its organization and structure were compared to other human-tropic Taenia tapeworms for which complete mitochondrial sequence data were available. The multiplex PCR assay with the Ta4978F, Ts5058F, Tso7421F, and Rev7915 primers will be useful for differential diagnosis, molecular characterization, and epidemiological surveys of human Taenia tapeworms.
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Affiliation(s)
- Hyeong-Kyu Jeon
- Department of Parasitology and Medical Research Institute, Chungbuk National University School of Medicine, Cheongju 361-763, Korea
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14
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Chai JY. Human taeniasis in the Republic of Korea: hidden or gone? THE KOREAN JOURNAL OF PARASITOLOGY 2013; 51:9-17. [PMID: 23467688 PMCID: PMC3587755 DOI: 10.3347/kjp.2013.51.1.9] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/20/2012] [Revised: 12/18/2012] [Accepted: 12/18/2012] [Indexed: 11/23/2022]
Abstract
History and current status of human taeniasis in the Republic of Korea, due to Taenia solium, Taenia asiatica, and Taenia saginata, are briefly reviewed. Until the 1980s, human taeniasis had been quite common in various localities of Korea. A study from 1924 reported 12.0% egg prevalence in fecal examinations. Thereafter, the prevalence of Taenia spp. ranged from 3% to 14% depending on the time and locality. Jeju-do, where pigs were reared in a conventional way, was the highest endemic area of taeniasis. An analysis of internal transcribed spacer 2 and mitochondrial cytochrome c oxidase 1 genes of 68 taeniasis cases reported from 1935 to 2005 in Korea by a research group revealed the relative occurrence of the 3 Taenia spp. as follows: T. solium (4.4%), T. asiatica (75.0%), and T. saginata (20.6%). However, national surveys on intestinal helminths conducted every 5 years on randomly selected people revealed that the Taenia egg prevalence dropped from 1.9% in 1971 to 0.02% in 1997 and finally to 0.0% in 2004. With the exception of 3 egg-positive cases reported in 2008 and 2 worm-proven cases in 2011, no more cases have been officially recorded. Based on these surveys and also on other literature, it can be concluded that taeniasis has virtually disappeared from Korea, although a few sporadic cases may remain hidden. Human cysticercosis is also expected to disappear within a couple of decades in Korea.
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Affiliation(s)
- Jong-Yil Chai
- Department of Parasitology and Tropical Medicine, Seoul National University College of Medicine, and Institute of Endemic Diseases, Seoul National University Medical Research Center, Seoul 110-799, Korea.
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Galán-Puchades MT, Fuentes MV. Taenia asiatica: the most neglected human Taenia and the possibility of cysticercosis. THE KOREAN JOURNAL OF PARASITOLOGY 2013; 51:51-4. [PMID: 23467406 PMCID: PMC3587749 DOI: 10.3347/kjp.2013.51.1.51] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/01/2012] [Revised: 12/18/2012] [Accepted: 12/18/2012] [Indexed: 11/23/2022]
Abstract
Not only Taenia solium and Taenia saginata, but also Taenia asiatica infects humans. The last species is not included in the evaluation of the specificity of the immunodiagnostic techniques for taeniasis/cysticercosis. There is currently no specific immunodiagnostic method for T. asiatica available. Therefore, due to the fact that molecular techniques (the only tool to distinguish the 3 Taenia species) are normally not employed in routine diagnostic methods, the 2 questions concerning T. asiatica (its definite geographic distribution and its ability to cause human cysticercosis), remain open, turning T. asiatica into the most neglected agent of human taeniasis-cysticercosis.
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Affiliation(s)
- M Teresa Galán-Puchades
- Department of Parasitology, Faculty of Pharmacy, University of Valencia, Av. Vicent Andrés Estellés s/n, 46100 Burjasssot, Valencia, Spain.
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Nakao M, Yanagida T, Okamoto M, Knapp J, Nkouawa A, Sako Y, Ito A. State-of-the-art Echinococcus and Taenia: Phylogenetic taxonomy of human-pathogenic tapeworms and its application to molecular diagnosis. INFECTION GENETICS AND EVOLUTION 2010; 10:444-52. [DOI: 10.1016/j.meegid.2010.01.011] [Citation(s) in RCA: 100] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/26/2010] [Accepted: 01/26/2010] [Indexed: 11/25/2022]
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Eom KS, Jeon HK, Rim HJ. Geographical distribution of Taenia asiatica and related species. THE KOREAN JOURNAL OF PARASITOLOGY 2010; 47 Suppl:S115-24. [PMID: 19885327 DOI: 10.3347/kjp.2009.47.s.s115] [Citation(s) in RCA: 63] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/12/2009] [Revised: 10/13/2009] [Accepted: 10/13/2009] [Indexed: 11/23/2022]
Abstract
Geographical information of Taenia asiatica is reviewed together with that of T. solium and T. saginata. Current distribution of T. asiatica was found to be mostly from Asian countries: the Republic of Korea, China, Taiwan, Indonesia, and Thailand. Molecular genotypic techniques have found out more countries with T. asiatica from Japan, the Philippines, and Vietnam. Specimens used in this paper were collected from around the world and mostly during international collaboration projects of Korean foundations for parasite control activities (1995-2009) in developing countries.
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Affiliation(s)
- Keeseon S Eom
- Department of Parasitology and Medical Research Institute, Chungbuk National University College of Medicine, Chongju, Chungbuk 361-763, Korea.
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Chai JY, Han ET, Shin EH, Sohn WM, Yong TS, Eom KS, Min DY, Um JY, Park MS, Hoang EH, Phommasack B, Insisiengmay B, Lee SH, Rim HJ. High prevalence of Haplorchis taichui, Phaneropsolus molenkampi, and other helminth infections among people in Khammouane province, Lao PDR. THE KOREAN JOURNAL OF PARASITOLOGY 2009; 47:243-7. [PMID: 19724697 DOI: 10.3347/kjp.2009.47.3.243] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/02/2009] [Revised: 07/30/2009] [Accepted: 08/03/2009] [Indexed: 11/23/2022]
Abstract
The prevalence of liver and intestinal helminth infections, including Opisthorchis, Haplorchis, Phaneropsolus, hookworms, Enterobius, and Taenia, was surveyed in Khammouane province, Lao PDR. Fecal specimens were collected from 1,242 people (590 men and 652 women) in 3 Mekong riverside villages and were examined by the Kato-Katz thick smear technique. The overall helminth egg positive rate was 81.1%. The positive rate for small trematode eggs, including Opisthorchis viverrini, heterophyids, and lecithodendriids, was 81.1% and the positive rate for hookworms was 6.7%. To obtain adult worms, 35 people who were positive for small trematode eggs were treated with 20-30 mg/kg praziquantel and 10-15 mg/kg pyrantel pamoate, and then purged. Diarrheic stools were collected from 33 of these people and searched for helminth parasites using a stereomicroscope. Mixed infections with various helminths (Haplorchis taichui, Haplorchis yokogawai, Prosthodendrium molenkampi, Phaneropsolus bonnei, echinostomes, hookworms, Trichostrongylus spp., Trichuris trichiura, Enterobius vermicularis, and/or Taenia saginata) were found. The total number of helminth specimens collected was 20,907 (approximately 634 per person). The most common species was H. taichui, followed by P. molenkampi, O. viverrini, P. bonnei, E. vermicularis, hookworms, and Trichostrongylus spp. These results show that diverse species of intestinal nematodes, trematodes, and cestodes are infecting humans in Khammouane province, Lao PDR.
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Affiliation(s)
- Jong-Yil Chai
- Department of Parasitology and Tropical Medicine, Seoul National University College of Medicine, and Institute of Endemic Diseases, Seoul National University Medical Research Center, Seoul, Korea.
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