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Thailand

NOT Open Access | Trophic Behavior and Species Diversity of the Anopheles barbirostris Complex (Diptera: Culicidae) in Thailand

May 5, 2021 - 10:25 -- NOT Open Access
Author(s): 
Udom C, Thanispong K, Manguin S, Chareonviriyaphap T, Fungfuang W
Reference: 
J Med Entomol. 2021 May 4:tjab067

Species of the Anopheles barbirostris complex (Myzorhynchus Series of the subgenus Anopheles) are potential vectors of malaria and filariasis parasites. Owing to the lack of reliable identification methods, the biting activity and host preference of the species within this complex have not been previous described. In this study, the trophic behavior and host preferences of the species in the complex were determined in Thailand, and a map of their geographical distributions constructed.

Implementation and success factors from Thailand’s 1-3-7 surveillance strategy for malaria elimination

April 28, 2021 - 15:52 -- Open Access
Author(s): 
Cheewanan Lertpiriyasuwat, Prayuth Sudathip, Preecha Prempree, et al.
Reference: 
Malaria Journal 2021 20:201, 27 April 2021

Thailand’s National Malaria Elimination Strategy 2017–2026 introduced the 1-3-7 strategy as a robust surveillance and response approach for elimination that would prioritize timely, evidence-based action. Under this strategy, cases are reported within 1 day, cases are investigated within 3 days, and foci are investigated and responded to within 7 days, building on Thailand’s long history of conducting case investigation since the 1980s. However, the hallmark of the 1-3-7 strategy is timeliness, with strict deadlines for reporting and response to accelerate elimination.

Glucose-6-phosphate dehydrogenase mutations in malaria endemic area of Thailand by multiplexed high‐resolution melting curve analysis

April 21, 2021 - 15:07 -- Open Access
Author(s): 
Usa Boonyuen, Duantida Songdej, Mallika Imwong, et al.
Reference: 
Malaria Journal 2021 20:194, 20 April 2021

Glucose-6-phosphate dehydrogenase (G6PD) deficiency, the most common enzymopathy in humans, is prevalent in tropical and subtropical areas where malaria is endemic. Anti-malarial drugs, such as primaquine and tafenoquine, can cause haemolysis in G6PD-deficient individuals. Hence, G6PD testing is recommended before radical treatment against vivax malaria. Phenotypic assays have been widely used for screening G6PD deficiency, but in heterozygous females, the random lyonization causes difficulty in interpreting the results. Over 200 G6PD variants have been identified, which form genotypes associated with differences in the degree of G6PD deficiency and vulnerability to haemolysis. This study aimed to assess the frequency of G6PD mutations using a newly developed molecular genotyping test.

A foci cohort analysis to monitor successful and persistent foci under Thailand’s Malaria Elimination Strategy

March 3, 2021 - 15:43 -- Open Access
Author(s): 
Prayuth Sudathip, Suravadee Kitchakarn, Jui A. Shah, Donal Bisanzio, Felicity Young, Deyer Gopinath, Niparueradee Pinyajeerapat, David Sintasath and Cheewanan Lertpiriyasuwat
Reference: 
Malaria Journal 2021 20:118, 27 February 2021

Thailand’s success in reducing malaria burden is built on the efficient “1-3-7” strategy applied to the surveillance system. The strategy is based on rapid case notification within 1 day, case investigation within 3 days, and targeted foci response to reduce the spread of Plasmodium spp. within 7 days. Autochthonous transmission is still occurring in the country, threatening the goal of reaching malaria-free status by 2024. This study aimed to assess the effectiveness of the 1-3-7 strategy and identify factors associated with presence of active foci.

Immunoglobulin G responses to variant forms of Plasmodium vivax merozoite surface protein 9 upon natural infection in Thailand

February 8, 2021 - 10:16 -- Open Access
Author(s): 
Songsaigath S, Makiuchi T, Putaporntip C, Pattanawong U, Kuamsab N, Tachibana H, Jongwutiwes S
Reference: 
Sci Rep. 2021 Feb 5;11(1):3201

Merozoite surface protein 9 (MSP9) constitutes a ligand complex involved in erythrocyte invasion by malarial merozoites and is a promising vaccine target. Plasmodium vivax MSP9 (PvMSP9) is immunogenic upon natural malaria exposure. To address whether sequence diversity in PvMSP9 among field isolates could affect natural antibody responses, the recombinant proteins representing two variants each for the N- and the C-terminal domains of PvMSP-9 were used as antigens to assess antibody reactivity among 246 P. vivax-infected patients' sera from Tak and Ubon Ratchathani Provinces in Thailand.

Plasmodium cynomolgi Co-infections among Symptomatic Malaria Patients, Thailand

February 2, 2021 - 16:48 -- Open Access
Author(s): 
Putaporntip C, Kuamsab N, Pattanawong U, Yanmanee S, Seethamchai S, Jongwutiwes S
Reference: 
Emerg Infect Dis. 2021 Feb;27(2):590-593

Among 1,180 symptomatic malaria patients, 9 (0.76%) infected with Plasmodium cynomolgi were co-infected with P. vivax (n = 7), P. falciparum (n = 1), or P. vivax and P. knowlesi (n = 1). Patients were from Tak, Chanthaburi, Ubon Ratchathani, Yala, and Narathiwat Provinces, suggesting P. cynomolgi is widespread in this country.

Electrocardiographic effects of four antimalarials for pregnant women with uncomplicated malaria on the Thailand-Myanmar border: a randomised controlled trial

January 27, 2021 - 10:15 -- Open Access
Author(s): 
Saito M, Yotyingaphiram W, Cargill Z, Gilder ME, Min AM, Phyo AP, San TD, Poe H, Chu C, White NJ, Nosten F, McGready R
Reference: 
Antimicrob Agents Chemother. 2021 Jan 25:AAC.02473-20

Quinoline antimalarials cause drug-induced electrocardiograph QT prolongation, a potential risk factor for torsade de pointes. The effects of currently used antimalarials on the electrocardiogram were assessed in pregnant women with malaria. Pregnant women with microscopy-confirmed parasitaemia of any malaria species were enrolled in an open-label randomised controlled trial on the Thailand-Myanmar border in 2010-2016. Patients were randomised to the standard regimen dihydroartemisinin-piperaquine (DP), artesunate-mefloquine (ASMQ), or an extended regimen of artemether-lumefantrine (AL+). Recurrent vivax infections were treated with chloroquine. Standard 12-lead electrocardiograms were assessed on day 0, 4-6 hour following the last dose and day 7.

Validation of PfSNP-LAMP-Lateral Flow Dipstick for Detection of Single Nucleotide Polymorphism Associated with Pyrimethamine Resistance in Plasmodium falciparum

November 19, 2020 - 13:33 -- Open Access
Author(s): 
Yongkiettrakul S, Kolié FR, Kongkasuriyachai D, Sattabongkot J, Nguitragool W, Nawattanapaibool N, Suansomjit C, Warit S, Kangwanrangsan N, Buates S
Reference: 
Diagnostics (Basel). 2020 Nov 13;10(11):E948

The loop-mediated isothermal amplification coupled with lateral flow dipstick (PfSNP-LAMP-LFD) was recently developed to detect single nucleotide polymorphism (AAT → ATT), corresponding to substitution of asparagine to isoleucine at amino acid position 51 in the P. falciparumdhfr-ts gene associated with antifolate resistance. In this present study, the PfSNP-LAMP-LFD was validated on 128 clinical malaria samples of broad ranged parasite densities (10 to 87,634 parasites per microliter of blood).

Geometric morphometrics to distinguish the cryptic species Anopheles minimus and An. harrisoni in malaria hot spot villages, western Thailand

November 19, 2020 - 13:24 -- Open Access
Author(s): 
Chatpiyaphat K, Sumruayphol S, Dujardin JP, Samung Y, Phayakkaphon A, Cui L, Ruangsittichai J, Sungvornyothin S, Sattabongkot J, Sriwichai P
Reference: 
Med Vet Entomol. 2020 Nov 18

Anopheles minimus Theobald 1901 and An. harrisoni Harbach & Manguin 2007 belong to the same species complex. They are morphologically similar and can exist in sympatry but have blood host preferences. The most accurate method for their identification is based on molecular techniques. Here, we measure the level of interspecific discrimination by geometric morphometry.

Seasonal dynamics and molecular differentiation of three natural Anopheles species (Diptera: Culicidae) of the Maculatus group (Neocellia series) in malaria hotspot villages of Thailand

November 14, 2020 - 16:12 -- Open Access
Author(s): 
Sumruayphol S, Chaiphongpachara T, Samung Y, Ruangsittichai J, Cui L, Zhong D, Sattabongkot J, Sriwichai P
Reference: 
Parasit Vectors. 2020 Nov 11;13(1):574

Anopheles sawadwongporni Rattanarithikul & Green, Anopheles maculatus Theobald and Anopheles pseudowillmori (Theobald) of the Anopheles maculatus group (Diptera: Culicidae) are recognized as potential malaria vectors in many countries from the Indian subcontinent through Southeast Asia to Taiwan. A number of malaria vectors in malaria hotspot areas along the Thai-Myanmar border belong to this complex. However, the species distribution and dynamic trends remain understudied in this malaria endemic region.

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