ArticleMalaria journal2021
Genetic population of Plasmodium knowlesi during pre-malaria elimination in Thailand.
Article in Malaria journal, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 8 papers, 1 of them a synthesis that pooled it.
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Who cites it
8 citing papers in PubMed, 1 synthesis or guideline pooled it, 11 citations in OpenAlex.
- Prevalence and determinants of zoonotic malaria in the Greater Mekong Subregion (GMS) and Malaysia: systematic review and meta-analysis.Malaria journal · 2025Pooled it
- Synthesis of qualitative evidence on community experiences and perceptions of Plasmodium knowlesi malaria and factors influencing prevention and healthcare-seeking behaviours in Malaysia.Malaria journal · 2026Review
- Emerging malaria in Indonesia: An overview ofParasite epidemiology and control · 2025Article
- Declining genetic polymorphism of the C-terminus Merozoite Surface Protein-1 amidst increased Plasmodium knowlesi transmission in Thailand.Malaria journal · 2024Article
- Declining Genetic Polymorphisms of the C-terminus Merozoite Surface Protein-1 Amidst IncreasedbioRxiv : the preprint server for biology · 2024Article
- A novel sensitive hexaplex high-resolution melt assay for identification of five human Plasmodium species plus internal control.Acta tropica · 2023Article
- Limited Polymorphism in the Dihydrofolate Reductase (dhfr) and dihydropteroate synthase genes (dhps) of Plasmodium knowlesi isolate from Thailand.Acta tropica · 2023Article
- Multidisciplinary Investigations of Sustained Malaria Transmission in the Greater Mekong Subregion.The American journal of tropical medicine and hygiene · 2022Article
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Authors and funding
10 authors at 3 institutions in 2 countries.
Funding
Abstract
backgroundThailand is committed to eliminating malaria by 2024. From 2013 to 2020, the total number of malaria cases have decreased, from 37,741 to 4474 (an 88.1% reduction). However, infections with Plasmodium knowlesi, a monkey malarial pathogen that can also infect humans, have been increasingly observed. This study focused on the molecular analysis of P. knowlesi parasites causing malaria in Thailand.
methodsUnder Thailand's integrated Drug Efficacy Surveillance (iDES), which includes drug-resistance monitoring as part of routine case-based surveillance and responses, specimens were collected from malaria patients (n = 966) between 2018 and 2020. Thirty-one mono P. knowlesi infections (3.1%), most of which were from eastern and southern Thailand, were observed and confirmed by nested PCR assay and DNA sequencing. To evaluate whether these pathogens were from different lineages, cluster analysis based on seven microsatellite genotyping markers and the merozoite surface protein 1 (pkmsp1) gene was carried out. The P. knowlesi pyrimethamine resistance gene dihydrofolate reductase (pkdhfr) was sequenced and homology modelling was constructed.
resultsThe results of analysing the seven microsatellite markers and pkmsp1 sequence demonstrated that P. knowlesi parasites from eastern Thailand were of the same lineage as those isolated in Cambodia, while the parasites causing malaria in southern Thailand were the same lineage as those isolated from Malaysia. The sequencing results for the pkdhfr genes indicated the presence of two mutations, Arg34Leu and a deletion at position 105. On analysis with homology modelling, the two mutations were not associated with anti-malarial drug resistance.
conclusionsThis report compared the genetic populations of P. knowlesi parasites in Thailand from 2018 to 2020 and have shown similar lineages as those isolated in Cambodia and Malaysia of P. knowlesi infection in Thailand and demonstrated that the P. knowlesi parasites were of the same lineages as those isolated in Cambodia and Malaysia. The parasites were also shown to be sensitive to pyrimethamine.
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