ArticleMalaria journal2022
Molecular markers of dihydroartemisinin-piperaquine resistance in northwestern Thailand.
Article in Malaria journal, 2022. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 4 papers, 1 of them a synthesis that pooled it.
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Who cites it
4 citing papers in PubMed, 1 synthesis or guideline pooled it, 4 citations in OpenAlex.
- Prevalence of Plasmodium falciparum plasmepsin2/3 gene duplication in Africa and Asia: a systematic review and meta-analysis.Malaria journal · 2025Pooled it
- Challenges and responses of malaria elimination in a high-endemic area along the Thai-Myanmar border: A health systems perspective.PLOS global public health · 2026Article
- No evidence of molecular markers of piperaquine resistance in southeastern Nigeria.Malaria journal · 2025Article
- The PfK13 G533S mutation confers artemisinin partial resistance in multiple genetic backgrounds ofAntimicrobial agents and chemotherapy · 2025Article
Corrections and comments
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Authors and funding
9 authors at 3 institutions in 2 countries.
Funding
Abstract
backgroundDihydroartemisinin-piperaquine (DHA-PPQ) combination therapy is the current first-line treatment for Plasmodium falciparum malaria in Thailand. Since its introduction in 2015, resistance to this drug combination has emerged in the eastern part of the Greater Mekong Subregion including the eastern part of Thailand near Cambodia. This study aimed to assess whether the resistance genotypes have arisen the western part of country.
methodsFifty-seven P. falciparum-infected blood samples were collected in Tak province of northwestern Thailand between 2013 and 2019. Resistance to DHA was examined through the single nucleotide polymorphisms (SNPs) of kelch13. PPQ resistance was examined through the copy number plasmepsin-2 and the SNPs of Pfcrt.
resultsAmong the samples whose kelch13 were successfully sequenced, approximately half (31/55; 56%) had mutation associated with artemisinin resistance, including G533S (23/55; 42%), C580Y (6/55; 11%), and G538V (2/55; 4%). During the study period, G533S mutation appeared and increased from 20% (4/20) in 2014 to 100% (9/9) in 2019. No plasmepsin-2 gene amplification was observed, but one sample (1/54) had the Pfcrt F145I mutation previously implicated in PPQ resistance.
conclusionsKelch13 mutation was common in Tak Province in 2013-2019. A new mutation G533S emerged in 2014 and rose to dominance in 2019. PPQ resistance marker Pfcrt F145I was also detected in 2019. Continued surveillance of treatment efficacy and drug resistance markers is warranted.
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