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Lu, Feng,Lim, Chae Seung,Nam, Deok Hwa,Kim, Kwonkee,Lin, Khin,Kim, Tong-Soo,Lee, Hyeong-Woo,Chen, Jun-Hu,Wang, Yue,Sattabongkot, Jetsumon,Han, Eun-Taek Allen Press, etc.] 2010 The American journal of tropical medicine and hygi Vol.83 No.3
<P>Parasite dihydrofolate reductase (DHFR) and dihydropteroate synthase (DHPS) are known target enzymes of antifolate drugs used for the treatment and prophylaxis of persons with malaria. We sequenced the Plasmodium vivax dihydrofolate reductase (pvdhfr) and dihydropteroate synthase (pvdhps) genes to examine the prevalence and extent of point mutations in isolates from malaria-endemic countries. Double mutations (S58R and S117N) or quadruple mutations (F57L/I, S58R, T61M, and S117T) in the pvdhfr gene were found in isolates from Thailand (96.4%) and Myanmar (71.4%), but in only one isolate (1.0%) from Korea, where sulfadoxine-pyrimethamine has never been used. The pvdhfr point mutations correlated strongly with the pvdhps point mutations and ranged from single to triple mutations (S382A, A383G, and A553G), among isolates from Thailand, Myanmar, and Korea. These findings suggests that the prevalence of mutations in pvdhfr and pvdhps in P. vivax isolates from different malaria-endemic countries is associated with selection pressure imposed by sulfadoxine-pyrimethamine.</P>
Thị Lam Thái,Hojong Jun,Seo Hye Park,Hương Giang Lê,이진영,안성규,강정미,Moe Kyaw Myint,Khin Lin,손운목,남호우,나병국,Tong-Soo Kim 대한기생충학ㆍ열대의학회 2019 The Korean Journal of Parasitology Vol.57 No.3
Toxoplasma gondii is an apicomplexan parasite that can cause toxoplasmosis in a wide range of warm-blood- ed animals including humans. In this study, we analyzed seroprevalence of T. gondii among 467 school children living in the rural areas of Pyin Oo Lwin and Naung Cho, Myanmar. The overall seroprevalence of T. gondii among school children was 23.5%; 22.5% of children were positive for T. gondii IgG, 0.4% of children were positive for T. gondii IgM, and 0.6% of children were positive for both T. gondii IgG and IgM. Geographical factors did not significantly affect the seropreva- lence frequency between Pyin Oo Lwin and Naung Cho, Myanmar. No significant difference was found between males (22.2%) and females (25.0%). The overall seroprevalence among school children differed by ages (10 years old [13.6%], 11-12 years old [19.8%], 13-14 years old [24.6%], and 15-16 years old [28.0%]), however, the result was not significant. Polymerase chain reaction analysis for T. gondii B1 gene for IgG-positive and IgM-positive blood samples were negative, indicating no direct evidence of active infection. These results collectively suggest that T. gondii infection among school children in Myanmar was relatively high. Integrated and improved strategies including reinforced education on toxoplas- mosis should be implemented to prevent and control T. gondii infection among school children in Myanmar.