Status and emerging issues in the use of praziquantel for treatment of human trematode and cestode infections are briefly reviewed. Since praziquantel was first introduced as a broadspectrum anthelmintic in 1975, innumerable articles describing its successful use in the treatment of the majority of human-infecting trematodes and cestodes have been published. The target trematode and cestode diseases include schistosomiasis, clonorchiasis and opisthorchiasis, paragonimiasis, heterophyidiasis, echinostomiasis, fasciolopsiasis, neodiplostomiasis, gymnophalloidiasis, taeniases, diphyllobothriasis, hymenolepiasis, and cysticercosis. However, Fasciola hepatica and Fasciola gigantica infections are refractory to praziquantel, for which triclabendazole, an alternative drug, is necessary. In addition, larval cestode infections, particularly hydatid disease and sparganosis, are not successfully treated by praziquantel. The precise mechanism of action of praziquantel is still poorly understood. There are also emerging problems with praziquantel treatment, which include the appearance of drug resistance in the treatment of Schistosoma mansoni and possibly Schistosoma japonicum, along with allergic or hypersensitivity reactions against praziquantel treatment. To cope with and overcome these problems, combined use of drugs, i.e., praziquantel and other newly introduced compounds such as triclabendazole, artemisinins, and tribendimidine, is being tried.
Artemisinins ; Benzimidazoles ; Cestoda ; Cestode Infections ; Clonorchiasis ; Cysticercosis ; Diphyllobothriasis ; Drug Resistance ; Echinostomiasis ; Fasciola ; Fasciola hepatica ; Humans ; Hymenolepiasis ; Hypersensitivity ; Opisthorchiasis ; Paragonimiasis ; Phenylenediamines ; Phosphatidylethanolamines ; Praziquantel ; Schistosoma japonicum ; Schistosoma mansoni ; Schistosomiasis ; Sparganosis ; Taenia ; Taeniasis ; Trematode Infections

Cestode Infections ; parasitology ; Humans ; Infant ; Male

Cystic echinococcosis (CE) caused by Echinococcus granulosus is a major public health problem worldwide, including Turkey. The aim of the current study was to identify the strains and to estimate the potential risk factors of E. granulosus in operated pediatric cases in eastern Turkey. Ten pediatric patients (7 boys and 3 girls) living in rural areas, with ages ranging from 3 to 15 years old and various clinical histories, were included in this study. Eight patients had only liver hydatid cyst, while 1 patient had liver and lung hydatid cyst and the other liver, lung, and spleen, together. There were 2 ruptured liver cysts. After surgery, during follow-up, no increase was observed in hemagglutination levels, there were no mortalities, and there was no evidence of recurrence at 2 years post operation in all patients. Molecular analysis was performed on hydatid cyst samples obtained from the 10 pediatric cases. According to mt-12S rRNA PCR results, all cases were found to be G1/G3 cluster of E. granulosus sensu stricto.
Adolescent ; Animals ; Child ; Child, Preschool ; Echinococcosis/parasitology/*surgery ; Echinococcosis, Hepatic/parasitology/surgery ; Echinococcosis, Pulmonary/parasitology/surgery ; Echinococcus granulosus/genetics/*isolation & purification ; Female ; Humans ; Male ; Turkey

Aged ; Brain ; parasitology ; Echinococcosis, Hepatic ; diagnosis ; etiology ; therapy ; Echinococcosis, Pulmonary ; diagnosis ; etiology ; therapy ; Female ; Humans ; Lymphoma, T-Cell ; complications

No abstract available.
Echinococcosis, Hepatic*

Adult ; Albendazole ; therapeutic use ; Biopsy ; Brain ; parasitology ; pathology ; Echinococcosis, Hepatic ; complications ; drug therapy ; pathology ; Echinococcosis, Pulmonary ; etiology ; pathology ; Female ; Humans ; Male ; Middle Aged

Human diphyllobolthriasis is chiefly caused by infection with Diphyllobothrium latum(D. latum) through eating raw or unproperly cooked fish such as salmon, trout or perch. D. latum is worldwidely distributed, but not a common parasite of humans, and its prevalence in Korea is not high. The first worm-proven case of D. latum infection was first reported in 1971 and about 30 cases have been reported in Korea until now. However, with the increasing popularity of eating raw salmon, trout and perch, this tapeworm infection tends to increase in Korea. Most of the patients infected by D. latum have not showed the specific symptoms and only non-specific gastrointestinal symptoms(anorexia, nausea, vomiting, diarrhea, abdominal pain). We report a case which includes a chain whitish, threadlike tapeworm segments spontaneously discharged in the patients stool. On reviewing the literature, the present case is the first report of D. latum infection by eating cultured salmon. The patient was treated with 600mg single dose of Praziquantel.
Cestoda ; Cestode Infections ; Diarrhea ; Diphyllobothrium* ; Eating ; Humans ; Korea ; Nausea ; Parasites ; Perches ; Praziquantel ; Prevalence ; Salmon ; Trout ; Vomiting

Morphological characteristics of Mesocestoides lineatus tetrathyridia collected from Chinese snakes and their adults recovered from experimental animals were studied. The tetrathyridia were detected mainly in the mesentery of 2 snake species, Agkistrodon saxatilis (25%) and Elaphe schrenckii (20%). They were 1.73 by 1.02 mm in average size and had an invaginated scolex with 4 suckers. Adult tapeworms were recovered from 2 hamsters and 1 dog, which were orally infected with 5-10 larvae each. Adults from hamsters were about 32 cm long and those from a dog were about 58 cm long. The scolex was 0.56 mm in average width with 4 suckers of 0.17 by 0.15 mm in average size. Mature proglottids measured 0.29 by 0.91 mm (av.). Ovaries and vitellaria bilobed and located in the posterior portion of proglottids. The cirrus sac was oval-shaped and located median. Testes were follicular, distributed in both lateral fields of proglottids, and 41-52 in number per proglottid. Gravid proglottids were 1.84 by 1.39 mm (av.) with a characteristic paruterine organ. Eggs were 35 by 27 microm in average size with a hexacanth embryo. These morphological characteristics of adult worms were identical with those of M. lineatus reported previously. Therefore, it has been confirmed that the tetrathyridia detected in 2 species of Chinese snakes are the metacestodes of M. lineatus, and 2 snake species, A. saxatilis and E. schrenckii, play the role of intermediate hosts.
Animals ; Cestode Infections/*parasitology ; Cricetinae ; Dogs ; Larva ; Mesocestoides/anatomy & histology/*classification/isolation & purification ; Snakes/*parasitology

We analyzed 320 clinical samples of parasitic infections submitted to the Department of Environmental Biology and Medical Parasitology, Hanyang University from January 2004 to June 2011. They consisted of 211 nematode infections, 64 trematode or cestode infections, 32 protozoan infections, and 13 infections with arthropods. The nematode infections included 67 cases of trichuriasis, 62 of anisakiasis (Anisakis sp. and Pseudoterranova decipiens), 40 of enterobiasis, and 24 of ascariasis, as well as other infections including strongyloidiasis, thelaziasis, loiasis, and hookworm infecions. Among the cestode or trematode infections, we observed 27 cases of diphyllobothriasis, 14 of sparganosis, 9 of clonorchiasis, and 5 of paragonimiasis together with a few cases of taeniasis saginata, cysticercosis cellulosae, hymenolepiasis, and echinostomiasis. The protozoan infections included 14 cases of malaria, 4 of cryptosporidiosis, and 3 of trichomoniasis, in addition to infections with Entamoeba histolytica, Entamoeba dispar, Entamoeba coli, Endolimax nana, Giardia lamblia, and Toxoplasma gondii. Among the arthropods, we detected 6 cases of Ixodes sp., 5 of Phthirus pubis, 1 of Sarcoptes scabiei, and 1 of fly larva. The results revealed that trichuriasis, anisakiasis, enterobiasis, and diphyllobothriasis were the most frequently found parasitosis among the clinical samples.
Animals ; Arthropods/*pathogenicity ; Cestode Infections/*epidemiology ; Humans ; Intestinal Diseases, Parasitic/epidemiology ; Malaria/epidemiology ; Nematode Infections/*epidemiology ; Protozoan Infections/*epidemiology ; Republic of Korea/epidemiology ; Trematode Infections/*epidemiology

The transition of important parasitic diseases in Korea is briefly reviewed in this article. Soiltransmitted helminthiases, such as ascariasis, trichuriasis, and hookworm infections, which had been prevalent all over the country, decreased remarkably, largely owing to the national control activities by means of mass examination-mass treatment schemes for school students. Paragonimiasis has shown significant reduction in its incidence, but clonorchiasis still remains as an important health-threatening trematode infection. Intestinal trematodiases, including metagonimiasis, heterophyidiases, and echinostomiases are prevalent, and new species, such as Gymonphalloides seoi and Neodiplostomum seoulense, have been documented as new human parasitic diseases. Tapeworm infections including larval cestodiases are also decreasing. Among the protozoan infections, amebiasis and malaria showed an apparent decreasing trend, but in recent years, vivax malaria has become a re-emerging disease. Brugian filariasis, which was prevalent in southern parts of the Korean peninsula, has been completely eliminated nowadays. In terms of the prevalence and distribution, clonorchiasis, enterobiasis, and vivax malaria are currently the major parasitoses of public health importance in Korea.
Amebiasis ; Ascariasis ; Cestode Infections ; Clonorchiasis ; Echinostomiasis ; Enterobiasis ; Filariasis ; Helminthiasis ; Hookworm Infections ; Humans ; Incidence ; Korea* ; Malaria ; Malaria, Vivax ; Paragonimiasis ; Parasitic Diseases* ; Prevalence ; Protozoan Infections ; Public Health ; Trematode Infections ; Trichuriasis