Recent trends of malaria in Thailand illustrate an increasing proportion of Plasmodium vivax, indicating the importance of P. vivax as a major causative agent of malaria. P. vivax malaria is usually considered a benign disease so the knowledge of this parasite has been limited, especially the genetic diversity and genetic structure of isolates from different endemic areas. The aim of this study was to examine the population genetics and structure of P. vivax isolates from 4 provinces with different malaria endemic settings in Thailand using 6 microsatellite markers. Total 234 blood samples from P. vivax mono-infected patients were collected. Strong genetic diversity was observed across all study sites; the expected heterozygosity values ranged from 0.5871 to 0.9033. Genetic variability in this study divided P. vivax population into 3 clusters; first was P. vivax isolates from Mae Hong Son and Kanchanaburi Provinces located on the western part of Thailand; second, Yala isolates from the south; and third, Chanthaburi isolates from the east. P. vivax isolates from patients having parasite clearance time (PCT) longer than 24 hr after the first dose of chloroquine treatment had higher diversity when compared with those having PCT within 24 hr. This study revealed a clear evidence of different population structure of P. vivax from different malaria endemic areas of Thailand. The findings provide beneficial information to malaria control programme as it is a useful tool to track the source of infections and current malaria control efforts.
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Low Genetic Diversity of Plasmodium vivax Circumsporozoite Surface Protein in Clinical Isolates from Southern Thailand Tachin Khulmanee, Thanyapit Thita, Kanyanan Kritsiriwutinan, Usa Boonyuen, Aminoh Saai, Kanjana Inkabjan, Rimi Chakrabarti, Pradipsinh K. Rathod, Srivicha Krudsood, Mathirut Mungthin, Rapatbhorn Patrapuvich Tropical Medicine and Infectious Disease.2024; 9(5): 94. CrossRef
Plasmodium vivax populations in the western Greater Mekong Subregion evaluated using a genetic barcode Yubing Hu, Yuling Li, Awtum M. Brashear, Weilin Zeng, Zifang Wu, Lin Wang, Haichao Wei, Myat Thu Soe, Pyae Linn Aung, Jetsumon Sattabongkot, Myat Phone Kyaw, Zhaoqing Yang, Yan Zhao, Liwang Cui, Yaming Cao, Karin Kirchgatter PLOS Neglected Tropical Diseases.2024; 18(7): e0012299. CrossRef
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Comparison of Vector Trapping Methods for Outdoor Biting Malaria Vector Surveillance in Thailand and Vietnam Ratchadawan Ngoenklan, Tran Thanh Duong, Vu Duc Chinh, Nguyen Quang Thieu, Jeffrey Hii, Michael J Bangs, Boonserm Aum-Aung, Wannapa Suwonkerd, Theeraphap Chareonviriyaphap, Nobuko Tuno Journal of Medical Entomology.2022; 59(6): 2139. CrossRef
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Genetic characteristics of Plasmodium falciparum may play a role in the treatment outcome of malaria infection. We have studied the association between diversity at the merozoite surface protein-1 (msp-1), msp-2, and glutamate-rich protein (glurp) loci and the treatment outcome of uncomplicated falciparum malaria patients along the Thai-Myanmar border who were treated with artemisinin derivatives combination therapy. P. falciparum isolates were collected prior to treatment from 3 groups of patients; 50 cases of treatment failures, 50 recrudescences, and 56 successful treatments. Genotyping of the 3 polymorphic markers was analyzed by nested PCR. The distribution of msp-1 alleles was significantly different among the 3 groups of patients but not the msp-2 and glurp alleles. The allelic frequencies of K1 and MAD20 alleles of msp1 gene were higher while RO33 allele was significantly lower in the successful treatment group. Treatment failure samples had a higher median number of alleles as compared to the successful treatment group. Specific genotypes of msp-1, msp-2, and glurp were significantly associated with the treatment outcomes. Three allelic size variants were significantly higher among the isolates from the treatment failure groups, i.e., K1270-290, 3D7610-630, G650-690, while 2 variants, K1150-170, and 3D7670-690 were significantly lower. In conclusion, the present study reports the differences in multiplicity of infection and distribution of specific alleles of msp-1, msp-2, and glurp genes in P. falciparum isolates obtained from treatment failure and successful treatment patients following artemisinin derivatives combination therapy.
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