The present study was undertaken to determine the acceptablility, tolerance and effectiveness of praziquantel in a rural population infected with Clonorchis sinensis and to suggest the suitable dosages of praziquantel for the field use on a large scale. A total of 121 patients with proven C. sinensis infection were treated by two dosages with praziquantel at a single dose of 40 mg/kg bwt and 2 doses of 30 mg/kg bwt in a single day. A single dose of 40 mg/kg bwt were given to 60 patients and 2 x 30mg/kg bwt were given to 61 patients. Follow-up examinations were carried out at about 30 and 60 days after treatment. Two months after therapy, 13(21.7%) of 60 patients who received a single dose of 40 mg/kg bwt were cured completely. Among these cured patients, 9(75.0%) out of 12 cases of light and only 4 out of 48 cases of moderate or heavy infection groups were cured. But in the non-cured cases the overall egg reduction rate was 89.1%. On the other hand, 36(59.0%) out of 61 patients treated with 2 x 30mg/kg bwt were cured at 60 days after treatment. Among these cured patients, all of the 13 cases of light infection and 18(69.2%) out of 26 cases of moderate and 5(23.8%) out of 21 cases of heavy infection groups were cured completely at 60 days after therapy.
However the overall egg reduction rate was 95.2% in the non-cured cases. Praziquantel is well tolerated and side effects consist particularly of mild and transient headache, dizziness and abdominal discomfort, etc. However there was no difference in regard to frequency and intensity of untoward side effects between the two dosage groups. The results obtained in this study suggest that a single dose of 40 mg/kg bwt for light infection, 2 x 30mg/kg bwt for moderate infection and 3 x 25mg/kg bwt for heavy infection groups will be recommended for the field use on a large scale.
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Artemether, artesunate, praziquantel and tribendimidine administered singly at different dosages against Clonorchis sinensis: A comparative in vivo study Shu-Hua Xiao, Xue Jian, Marcel Tanner, Zhang Yong-Nian, Jennifer Keiser, Jürg Utzinger, Qiang Hui-Qiang Acta Tropica.2008; 106(1): 54. CrossRef
Praziquantel(Distocide) in treatment of Clonorchis sinensis infection Byong Seol Seo, Soon Hyung Lee, Jong Yil Chai, Sung Tae Hong The Korean Journal of Parasitology.1983; 21(2): 241. CrossRef
Epidemiological studies on Clonorchis sinensis infection along the Nam-river in Gyeongnam province, Korea Kyoung Hoon Bae, Yung Kyum Ahn, Chin Thack Soh, Hiroshi Tsutsumi The Korean Journal of Parasitology.1983; 21(2): 167. CrossRef
The present work was to localize and isolate the anthelmintic substance from stem cortex of Machilis thunbergii which grows in all parts of the Korea peninsula.
The dried M. thunbergii bark was extracted with a solvent mixture (Methanol: Ethyl acetate/1:1) by a Soxhlet extractor at 70C for 24 hours, and then the extract was separated into solid matter (negative wormicidal) and benzene extract (positive wormicidal) by benzene solvent. The anthelmintic action was observed on the cercaria, the liberated metacercaria and the adult of Clonorchis sinensis. On the silica gel thin layer chromatography with a spot of benzene extract in benzene solvent, nine spots were observed in iodine chamber and the spot of Rf. 0.16 value of them appeared the most strong wormicidal effect on the cercaria and the liberated metacercaria of C. sinensis. Afterward, a 0.3 g colourless solid substance which was equivalent to the Rf. 0.16 value spot was isolated from the benzene extract of 3 kg M. thunbergii stem cortex by means of silica gel column chromatography using benzene carrier, and the adult of C.
sinensis was killed within 6 minutes by 0.05 percent solution of the substance.
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The efficacy of the cellophane thick smear(CTS) technique was reassessed for detecting helminths eggs such as Ascaris lumbricoides, Trichuris trichiura and Clonorchis sinensis, in comparsion with the formalin-ether(F-E) one, with repeated smears per case. From the fecal samples of 411 ROK Army soldiers, a total of 3,288 smears were made and examined; 4 by CTS and 4 by F-E techniques. The expected egg detectability with one, two, three or four smears by each technique was mathemativally calculated. The results were as follows: When the results of all 8 smears per case were integrated, the number of cases eith Ascaris egg were 54(13.1%), Trichuris 125(30.4%) and Clonorchis 33(8.0%).
Some other kinds of helminths eggs and protozoan cysts were found from a few cases each. The calculated detectability of Ascaris eggs by CTS technique was fairly high(95.8 - 96.3%) with 1-4 smears, while that by F-E technique was not so high(73.1 - 88.9%). In case of Trchuris eggs, the egg detectability by CTS technique with 1-4 smears was a little lower(62.2-86.4%) than that by F-E technique(73.4 - 91.2%).
The detectability of Clonorchis eggs with 1-4 smears by CTS technique was the lowest(44.7 - 60.6%) among the three helminths as well as much lower than that by F-E technique(67.4 - 87.9%).
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The effects of salt on the development of Aedes togoi and the infecton of Brugia pahangi were studied. Salt concentrations over 7.2% completely got rid of pupae and adults. The salt concentrations 0% to 3.6% reduced pupal development from 86.6% to 72.8% and adult from 70.3% to 53.3%. B. pahangi infestations and infection rates were also reduced in the mosquitoes reared at salt concentrations of 1.8% and 3.6%. Trends of retardation in the filarial development were observed when the salt concentrations were increased.
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This study was carried out to outline the geographical distribution of the sweetfish which were infected by the metacercariae of Metagonimus yokogawai from August to October in 1979. The infection status was examined both by the muscle compression method and by digestion technique.
The result was summarized as follows: A total of 197 sweetfish, Plecoglossus altivelis was collected, 125 fish from 5 streams along the East Coast and 72 fish from 4 streams along the South Coast. Total 125(63.5 percent) fish were infected by the metacercariae of M. yokogawai. The rate and intensity of infection in the south coastal areas were much higher than those in the east coastal areas; the rate was 42.4 percent in the East and 100 percent in the South, mean number of metacercariae per fish was 721 in the East and 14,308 in the South, and mean number of metacercariae per gram of flesh was 43 in the East compare with 904 in the South. The sweetfish infected by the metacercaria of M.
yokogawai were newly observed in 5 foci, i.e., Yeongogcheon in Myeongju Gun and Namdaecheon in Gangneung Si, Gangweon Do and Wangpicheon in Uljin Gun, Gyeongsangbug Do in the East, and a branch of Namgang in Euiryeong Gun and Sinhyeoncheon in Geoje Gun, Gyeongsangnam Do in the South. The rate of metacercarial infection was 4.1 percent in Yeongogcheon and 100 percent in others. The number of metacercariae in a fish ranged from 9 to 45,018 and the number of metacercariae per gram of flesh was the lowest in Gangneung Namdaecheon as 19 and the highest in Geoje Sinhyeoncheon as 1,237. Summarizing these findings with previous records, M. yokogawai might be prevalent in the streams along the East Coast southern from Myeongju Gun, Gangweon Do and along the South Coast in Korea.
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A total of 421 patients hospitalized in St. Mary's Hospital were examined by indirect latex agglutination test in order to evaluate the Toxoplasma antibody in Korean from June to August 1981. The test sera of the patients were obtained from each age group by random sampling. The 421 samples of test sera showed negative in 153, 1:2 in 157, 1:4 in 59, 1:8 in 27, 1:16 in 7, 1:32 in 9, 1:64 in 2, 1:128 in 4 and 1:256 in 3 cases, respectively. The positive rate of Toxoplasma antibody was 4.3 percent in this sample when indirect latex antibodies of 1:32 or higher were regarded as positive. The titers of positive Toxoplasma antibodies were increased by age.
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Serologic Survey of Toxoplasmosis in Seoul and Jeju-do, and a Brief Review of Its Seroprevalence in Korea Hyemi Lim, Sang-Eun Lee, Bong-Kwang Jung, Min-Ki Kim, Mi Youn Lee, Ho-Woo Nam, Jong-Gyun Shin, Cheong-Ha Yun, Han-Ik Cho, Eun-Hee Shin, Jong-Yil Chai The Korean Journal of Parasitology.2012; 50(4): 287. CrossRef
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butschlii 0.2 percent, G. lamblia 0.5 percent and C. mesnili 0.5 percent. Sogcho-city showed the highest positive rate as 15.2 percent, Myeongju county was the next as 11.3 percent and Weonju-city showed the lowest positive rate as low as 3.9 percent. By age, the highest positive rate was found in 20-29 age group(12.4 percent). Female (9.5 percent) showed a slight higher positive rate than male (8.4 percent).
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A survey on the prevalence of intestinal protozoan cysts was conductcd in Jeonlanam Do (Province), Korea in 1981. A total of 4,116 specimens was collected from 2,035 male and 2,086 female inhabitants in 4 urban and 7 rural areas. Each case was selected randomly to represent 1,000 inhabitants referred to the census in 1980. Formalin-Ether sedimentation technique was employed to concentrate the cysts and one Lugol's iodine stained smear was examined for each case. The results were summarized as follows: The cases who passed out protozoan cysts of any kind were 9.1 percent out of total 4,116 examined, and cumulative positive rate was 11.0 percent. Among the positive cases, 16.5 percent were infected by two or more species of protozoa. Total 5 species of cysts were detected and the positive rates were as follows; Entamoeba histolytica 1.4 percent, E. Coli, 4.9 percent, Endolimax nana 2.5 percent, Iodamoeba butschlii 0.4 percent and Giardia lamblia 1.9 percent. The cyst positive rates varied greatly by the surveyed area. The positive rate in rural area was 11.6 percent compared with 5.7 percent in urban area. The highest rate was found 14.5 percent in Gurye Gun (County) and the lowest 3.6 percent in Mogpo Si (City).
Female showed much higher positive rate than male as 11.8 percent compared with 6.4 percent and the cumulative rate 14.2 percent and 7.6 percent respectively. By age group, the rate was highest as 13.9 percent in 40-49 years and next 12.5 percent in over 60 years group. The cyst prevalence rate diminished remarkably in Jeonlanam Do compared to previous records. However, the finding that 20.2 percent of females of 40 years were the carrier of protozoan cysts was an important information in public health point of view.
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Status of intestinal parasitic infections in a remote island, Yondo, Jeonranam-do(province) Gi Soo Goo, Duk Young Min, Myoung Hee Ahn, Kyong Min Kim, Mi Hyea Leem, Hak Sun Yoon The Korean Journal of Parasitology.1988; 26(4): 275. CrossRef
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The authors reported a case of niclofolan intoxication occurred during the trial of clonorchiasis treatment. The case, a 15 years old Korean schoolboy, took niclofolan(Bilevon) of total 473 mg(11 mg/kg) in 11 divided doses during 20 days. And the case suffered from neurologic symptoms such as severe headache, dizziness, nausea, vomiting, blurred vision, papilledema, retinal hemorrhage, an epsiode of seizure attack and elevated intracranial pressure, and hepatotoxic symptoms such as hepatomegaly, increased serum transaminases, and shoulder pain, excessive sweating and weight loss. Therapy was concentrated to the management of the elevated intracranial pressure.
Hepatotoxic manifestations subsided within one month. The clinical signs related to elevated intracranial pressure persisted two months. Body weight regained after 2 months.
And the symptoms of headache, dizziness and vomiting were complained intermittently until 4 months after onset.
However, no subsequent clinical problems related with this episode has been noted until this record.
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The authors reported a case of ectopic paragonimiasis in a 40 year old Korean housewife who came to the hospital because of abdominal mass and pain. She was proved to have multiple parasitic granulomas involving lung, uterus, uterine tube and subcutaneous tissue. The ovary was also the site of parasitism. The past history revealed an episode of ingestion of fresh water crabs soaked in soybean sauce which were obtained in a market of Seoul City 2 years prior to the present illness. The patient was treated for tuberculosis for a year without confirmation of etiologic agent. After surgical removal of all abdominal and most of pelvic granulomas, the patient was treated with praziquantel 25 mg/kg t.i.d. for 3 days, and was judged to be cured after 4 months.
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