• 제목/요약/키워드: vivax

검색결과 127건 처리시간 0.018초

Two new genotypes of Plasmodium vivax circumsporozoite protein found in the Republic of Korea

  • Kho, Weon-Gyu;Park, Yeong-Hong;Chung, Joon-Yong;Kim, Jong-Pil;Hong, Sung-Tae;Lee, Won-Ja;Kim, Tong-Soo;Lee, Jong-Soo
    • Parasites, Hosts and Diseases
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    • 제37권4호
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    • pp.265-270
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    • 1999
  • The gene encoding Plasmodium vivax circumsporozoite protein (PvCSP) exhibits polymorphism in many geographical isolates. The present study was designed to investigate polymorphism in PvCSP gene of P. vivax isolates in Korea. Thirty isolates, obtained from indigenous cases in Yonchon-gun, Kyonggi-do in 1997, were subjected for sequencing and RFLP analysis of the repeat and post-repeat regions of PvCSP gene and two genotypes (SK-A and SK-B) were identified. The genotype of 19 isolates was SK-A and that of 11 isolates was SK-B. Although the number of 12-base repeats present in SK-A was three while two were found in a Chinese strain CH-5, the repeat sequence of SK-A was identical to that of CH-5 except for one base substitution. Compared with known data there was no identical isolates with SK-B, but the sequence of SK-B was similar to that of a North Korean (NK) isolate. These results indicate that two genotypes of PvCSP coexist in the present epidemic area of Korea and the present parasite may originate from East Asia. RFLP would be useful to classify genotypes of P. vivax population instead of gene sequencing.

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Prevalence of Drug Resistance-Associated Gene Mutations in Plasmodium vivax in Central China

  • Lu, Feng;Wang, Bo;Cao, Jun;Sattabongkot, Jetsumon;Zhou, Huayun;Zhu, Guoding;Kim, Kwonkee;Gao, Qi;Han, Eun-Taek
    • Parasites, Hosts and Diseases
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    • 제50권4호
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    • pp.379-384
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    • 2012
  • Resistance of Plasmodium spp. to anti-malarial drugs is the primary obstacle in the fight against malaria, and molecular markers for the drug resistance have been applied as an adjunct in the surveillance of the resistance. In this study, we investigated the prevalence of mutations in pvmdr1, pvcrt-o, pvdhfr, and pvdhps genes in temperate-zone P. vivax parasites from central China. A total of 26 isolates were selected, including 8 which were previously shown to have a lower susceptibility to chloroquine in vitro. For pvmdr1, pvcrt-o, and pvdhps genes, no resistance-conferring mutations were discovered. However, a highly prevalent (69.2%), single-point mutation (S117N) was found in pvdhfr gene. In addition, tandem repeat polymorphisms existed in pvdhfr and pvdhps genes, which warranted further studies in relation to the parasite resistance to antifolate drugs. The study further suggests that P. vivax populations in central China may still be relatively susceptible to chloroquine and sulfadoxine-pyrimethamine.

Coexistence of Malaria and Thalassemia in Malaria Endemic Areas of Thailand

  • Kuesap, Jiraporn;Chaijaroenkul, W.;Rungsihirunrat, K.;Pongjantharasatien, K.;Na-Bangchang, Kesara
    • Parasites, Hosts and Diseases
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    • 제53권3호
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    • pp.265-270
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    • 2015
  • Hemoglobinopathy and malaria are commonly found worldwide particularly in malaria endemic areas. Thalassemia, the alteration of globin chain synthesis, has been reported to confer resistance against malaria. The prevalence of thalassemia was investigated in 101 malaria patients with Plasmodium falciparum and Plasmodium vivax along the Thai-Myanmar border to examine protective effect of thalassemia against severe malaria. Hemoglobin typing was performed using low pressure liquid chromatography (LPLC) and ${\alpha}$-thalassemia was confirmed by multiplex PCR. Five types of thalassemia were observed in malaria patients. The 2 major types of thalassemia were Hb E (18.8%) and ${\alpha}$-thalassemia-2 (11.9%). There was no association between thalassemia hemoglobinopathy and malaria parasitemia, an indicator of malaria disease severity. Thalassemia had no significant association with P. vivax infection, but the parasitemia in patients with coexistence of P. vivax and thalassemia was about 2-3 times lower than those with coexistence of P. falciparum and thalassemia and malaria without thalassemia. Furthermore, the parasitemia of P. vivax in patients with coexistence of Hb E showed lower value than coexistence with other types of thalassemia and malaria without coexistence. Parasitemia, hemoglobin, and hematocrit values in patients with coexistence of thalassemia other than Hb E were significantly lower than those without coexistence of thalassemia. Furthermore, parasitemia with coexistence of Hb E were 2 times lower than those with coexistence of thalassemia other than Hb E. In conclusion, the results may, at least in part, support the protective effect of thalassemia on the development of hyperparasitemia and severe anemia in malaria patients.

ELISA detection of vivax malaria with recombinant multiple stage-specific antigens and its application to survey of residents in endemic areas

  • Kim, Sera;Ahn, Hye-Jin;Kim, Tong-Soo;Nam, Ho-Woo
    • Parasites, Hosts and Diseases
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    • 제41권4호
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    • pp.203-207
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    • 2003
  • An ELISA was developed for the diagnosis of vivax malaria using multiple stage-specific recombinant antigens of Plasmodium vivax. The DNA from the whole blood of a malaria patient was used as template to amplify the coding regions for the antigenic domains of circumsporozoite protein (CSP-1), merozoite surface protein (MSP-1), apical merozoite antigen (AMA-1), serine repeat antigen (SERA), and exported antigen (EXP-1). Each amplified DNA fragment was inserted into pQE30 plasmid to induce the expression of His-tagged protein in Escherichia coli (M15 strain) by IPTG. His-tagged proteins were purified by Ni-NTA metal-affinity chromatography and used as antigens for ELISA with patient sera that were confirmed previously by blood smear examinations. When applied to patient sera, 122 (80.3%) out of 152 vivax malaria cases reacted to at least one antigen, while no reactions were observed with 128 uninfected serum samples. We applied this ELISA to the screening of 3,262 civilian residents in endemic regions near the DMZ, which resulted in 236 positively detected (7.2%) cases. This method can be applied to serological diagnosis and mass screening in endemic regions, or can be used as a safety test for transfusion blood in endemic areas.

Mosquito Species Composition and Plasmodium vivax Infection Rates on Baengnyeong-do (Island), Republic of Korea

  • Foley, Desmond H.;Klein, Terry A.;Lee, In-Yong;Kim, Myung-Soon;Wilkerson, Richard C.;Harrison, Genelle;Rueda, Leopoldo M.;Kim, Heung-Chul
    • Parasites, Hosts and Diseases
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    • 제49권3호
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    • pp.313-316
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    • 2011
  • Vivax malaria is a significant military and civilian health threat in the north of the Republic of Korea (ROK). The island of Baengnyeong-do is the westernmost point of the ROK and is located close to the southwestern coast of the Democratic People's Republic of Korea (DPRK). Mosquitoes were collected using a black light trap on Baengnyeong-do, and Anopheles spp. were assayed by PCR, to identify the species, and screened for sporozoites of Plasmodium vivax. Of a subsample of 257 mosquitoes, Anopheles lesteri was the most frequently collected (49.8%), followed by Anopheles sinensis (22.6%), Anopheles pullus (18.7%), Anopheles kleini (7.8%), and Anopheles belenrae (1.2%). The overall sporozoite rate was 3.1%, with the highest rates observed in An. kleini (15.0%), An. sinensis (5.2%), and An. lesteri (1.6%). No sporozoite positive An. pullus or An. belenrae were observed. The results extend our knowledge of the distribution and potential role in malaria transmission of An. kleini, An. lesteri, and An. sinensis, for an area previously considered to be at a low risk for contracting vivax malaria.

소아에 발생한 삼일열 말라리아의 임상적 특성 (Clinical Features of Indigenous Vivax Malaria in Children)

  • 이은진;이종국;조종래
    • Pediatric Infection and Vaccine
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    • 제10권2호
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    • pp.200-207
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    • 2003
  • 목 적 : 말라리아는 국내에서 1970년대 말에 소멸된 것으로 알려져 있었으나, 1993년 비무장지대에 근무하던 군인에서 첫 환자가 발생한 이후, 지속적으로 증가되어 2000년에는 4,142명, 2001년에는 2,556명, 2002년에는 1,797명의 말라리아 환자가 보고되었다. 1999년부터는 민간인의 비율이 점차 증가되고 있고, 토착형 말라리아 환자가 늘어남에 따라 국내에 존재하는 매개숙주(중국 얼룩날개 모기)에 의해 주민간에 전파될 가능성도 높아진다. 저자들은 말초혈액 도말 검사 및 말라리아 항체 검사에서 말라리아로 확진된 소아 환자 13명을 조사하여 역학적 분석 및 임상적 특성을 알아보고자 하였다. 방 법 : 2000년 1월부터 2003년 8월까지 일산백병원에 내원한 소아 환자 중 말초혈액 도말 검사 및 말라리아 항체 검사로 확진된 15세 이하의 소아 환자 13명에 대하여 의무기록을 후향적으로 조사하였다. 결 과 : 13례 모두 토착형 말라리아 감염이었고, 원인 원충은 삼일열 말라리아(Plasmodium vivax)였다. 13례 중 남아와 여아의 비율은 9 : 4이었고, 발병 당시 평균 연령은 $9.5{\pm}3.6$세였다. 지역별로는 13례 중 9례가 일산 시내였으며, 11례의 발병 시기가 6~8월로 여름에 주로 발생했다. 13례 중 2례만이 3일 주기의 발작적인 발열을 보였고 나머지 11례는 지속적인 발열 및 불규칙한 발열 양상을 보였다. 혈소판 감소증은 가장 두드러진 소견으로 13례 중 12례에서 동반되었으며, 3례에서는 범혈구 감소증을 보였다. 신생아를 제외한 12례에서 hydroxychloroquine과 primaquine을 투약했고, 이후 시행한 혈액 도말 검사상 더 이상의 원충은 발견되지 않았고 혈액학적 이상 소견 역시 호전되었다. 결 론 : 저자들이 경험한 소아 말라리아 환아는 모두 Plasmodium vivax에 의해 발병되고 일부 환아는 유행외 지역에서 발병된 것으로 보아 이 원충에 의한 토착화의 확산을 추정할 수 있었다. 또한 전형적 삼일열 말라리아의 발열 양상이 없다하여도 혈소판 감소증 소견이 동반된 발열 환아에서 이 질환을 의심하여야 하며 말라리아 항체 검사가 선별 검사로 유용한 것으로 추정된다.

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경기지역 소아에서 발생된 삼일열 말라리아의 역학 및 임상적 특성 (Epidemiologic and Clinical Features of Indigenous Vivax Malaria in Children in Kyonggi-do Province Area)

  • 김종호;이윤경;김종현;허재균;장기영;강혜련;강진한
    • Pediatric Infection and Vaccine
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    • 제7권2호
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    • pp.218-224
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    • 2000
  • 목 적 : 1970년대 이후 약 20년간 발생이 없었던 삼일열 말라리아가 1993년부터 발생되어 점차 확산되는 추세에 있어 과거와 같은 토착화에 대한 우려가 높다. 국내에서 말라리아의 토착화를 막기 위하여는 현재 발생되는 말라리아 대한 역학 및 임상 특성에 관한 연구가 제일 우선되어야 할 것이다. 한편 성인에 비해 발생율은 낮으나 소아에서도 환자가 증가되는 추세에 있어 소아에서도 동일한 관점에서 역학 및 임상 연구가 요구되고 있다. 이와 같은 배경에서 말라리아 다발생 지역인 경기지역의 소아에 발생된 말라리아의 역학 연구를 후향적으로 실시하였다. 방 법 : 1998년 9월부터 1999년 8월까지 경기지역 종합병원 및 국공립 의료기관에서 말초 혈액도말 검사상 말라리아로 진단된 15세 이하의 소아 환자를 대상으로 발생 연령 및 성별, 발생 시기, 발생 지역, 발생 역학적 배경, 발열의 양상, 동반 증상, 진찰상 특이 소견, 일반검사 소견, 말초혈액 도말검사 소견, 치료와 연관된 사항 및 예후에 관한 내용의 의무기록을 통하여 후향적 연구를 시행하였다. 결 과 : 연구대상수는 총 21명으로서 남녀비는 2:1이었고 5세 이하에서도 삼일열 말라리아가 발생되었으나 11세 이상 15세 이하의 연령에서제일 많이 발생(14명;66.7%)되었다. 발생시기는 2월, 5,월, 6월, 10월에 각 1명씩 발생하였고 4월, 9월에 각 2명이 그리고 8월에 4명, 7월에 9명이 발생되었다. 환아가 발생된 동일 거주지역과 가족내에서 성인 환자 발생이 있었고, 지역적으로 파주, 의정부, 부평, 연천, 동두천, 포천, 철원, 부천의 순으로 다발생하였다. 임상적으로 발열의 양상은 48시간 간격의 주기성 발열이 15명, 24시간 간격의 주기성 발열이 4명, 비주기성 발열이 2명에서 보였고 발열외에 두통, 구토, 식욕부진, 오심, 오한, 권태감, 복통, 설사 등의 증상이 동반되었다. 진찰 소견상 비장비대가 제일 흔히 발현되었고, 검사 소견상 빈혈, 혈소판 감소증, 비정상 간기능, 백혈구 감소, 혈뇨의 순으로 이상 소견이 나타났다. 말초혈액 도말검사에서 Plasmodium vivax의 원충 단계는 young trophozite, gametocyte, schizont순으로 확인되었다. 전 예에서 chlorquine 약제의 치료반응이 좋았고 합병증이 없었으며 추적 가능한 8례에서도 재발은 없었다. 결 론 : 1998년 9월부터 1999년 8월 사이에 경기지역 소아에서 발생된 말라리아는 경기 북부지역의 10세 이상 고연령 소아에서 주로 하계절에 발생되며, 주기성 발열이 임상적으로 주된 증상이며 진찰상 비장비대가 주된 양성 소견이었으며 말초 혈액 도말검사상 young trphozoite가 제일 많이 발견됨을 알 수 있었다. 전반적으로 소아 환자에서의 치료 약제 반응은 좋고 합병증이 없이 양호한 경과를 보이며 재발도 거의 없는 것을 확인하였다.

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Travelers' malaria among foreigners at the Hospital for Tropical Diseases, Bangkok, Thailand - a 6-year review (2000-2005)

  • Piyaphanee Watcharapong;Krudsood Srivicha;Silachamroon Udomsak;Pornpininworakij Karnchana;Danwiwatdecha Phatcharee;Chamnachanan Supat;Wilairatana Polrat;Looareesuwan Sornchai
    • Parasites, Hosts and Diseases
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    • 제44권3호
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    • pp.229-232
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    • 2006
  • We retrospectively examined the charts of travelers admitted to the Hospital for Tropical Diseases, Bangkok, Thailand, with malaria during the years 2000-2005. Twenty-one cases of malaria were identified, of which 12 (57%) were Plasmodium vivax infections and 9 (43%) were P. falciparum infections. There was one mixed case with vivax and falciparum infection. Only 1 P. falciparum case had complications. All cases were successfully treated with standard antimalarial drugs. Only 3 of the 21 cases were thought to be acquired in Thailand, the rest were regarded to be imported.

Vector competence of Anopheles lesteri, Baisas and Hu (Diptera: Culicidae) to Plasmodium vivax in Korea

  • E-Hyun SHIN;Tong-Soo KIM;Hyeong-Woo LEE
    • Parasites, Hosts and Diseases
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    • 제40권1호
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    • pp.41-44
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    • 2002
  • Three anopheline mosquitoes in Korea were studied for their abilities as vectors for Plasmodium vivax. The female mosquitoes of Anopheles lesteri. An. pullus and An. sinensis were allowed to suck malaria patient blood until fully fed, and they were then bred for 2 weeks to develop from malaria parasites to sporozoites. The result from the above confirmed the sporozoites in one An. lesteri of one individual and five An. sinensis of six individuals. We also confirmed that An. sinensis was the main vector to transmit malaria and An. lesteri as well as An. sinensis were able to carry Korean malaria parasites. Therefore. we propose that diversified study is needed to manage malaria projects.

Spontaneous Splenic Rupture in a Vivax Malaria Case Treated with Transcatheter Coil Embolization of the Splenic Artery

  • Kim, Na Hee;Lee, Kyung Hee;Jeon, Yong Sun;Cho, Soon Gu;Kim, Jun Ho
    • Parasites, Hosts and Diseases
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    • 제53권2호
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    • pp.215-218
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    • 2015
  • An enlarged spleen is considered one of the most common signs of malaria, and splenic rupture rarely occurs as an important life-threatening complication. Splenectomy has been recommended as the treatment of choice for hemodynamically unstable patients. However, a very limited number of splenic rupture patients have been treated with transcatheter coil embolization. Here we report a 38-year-old Korean vivax malaria patient with ruptured spleen who was treated successfully by embolization of the splenic artery. The present study showed that angiographic embolization of the splenic artery may be an appropriate option to avoid perioperative harmful effects of splenectomy in malaria patients.