Plasmodium falciparum isolates were obtained from Thai patients attending a malaria clinic on the Thai-Kampuchean border over 4 cross-sectional surveys carried out at 3-monthly intervals. The genetic structure of the parasite populations was determined by nested polymerase chain reaction (PCR) amplification of polymorphic regions of 3 P. falciparum antigen genes: msp1, msp2 and glurp. Although a high degree of diversity characterized these isolates, the overall population structure of the parasites associated with patent malaria infections was observed to remain relatively stable over time. The highest degree of polymorphism was observed with msp2, and the mean number of lines per infection (multiplicity of infection) calculated with this marker was higher than that obtained using msp1 or glurp alone, or combined. Infections with > or = 2 parasite lines were seen in 76% of the samples, and were proportionally more numerous at the start and end of the rainy season. Two interesting exceptions to the random distribution were observed and involved 2 allelic variants which in one case were found dissociated (msp1 MAD20-family) and in the other were associated (msp2 FC27-family). The epidemiological significance of these types of data is discussed.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/s0035-9203(99)90120-7 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Antimalarial therapeutic efficacy studies are vital for monitoring drug efficacy in malaria-endemic regions. The WHO recommends genotyping polymorphic markers including msp-1, msp-2, and glurp for distinguishing recrudescences from reinfections. Recently, WHO proposed replacing glurp with microsatellites (Poly-α, PfPK2, TA1).
View Article and Find Full Text PDFMalaria prevalence, transmission potential and efficacy of artemisinin-based combination therapy in the Kenyan Central highlands: a zone previously characterized as malaria-free.
Malar J
January 2025
Centre for Biotechnology Research and Development, Kenya Medical Research Institute (KEMRI), Nairobi, Kenya.
Background: The current study sought to re-evaluate malaria prevalence, susceptibility to artemisinin-based combination therapy (ACT), transmission patterns and the presence of malaria vectors in the Kikuyu area of the Kenyan Central highlands, a non-traditional/low risk malaria transmission zone where there have been anecdotal reports of emerging malaria infections.
Methods: Sampling of adult mosquitoes was done indoors, while larvae were sampled outdoors in June 2019. The malaria clinical study was an open label non-randomized clinical trial where the efficacy of one ACT drug, was evaluated in two health facilities.
Genetic profiling of Plasmodium falciparum antigenic biomarkers among asymptomatic pregnant women on intermittent preventive treatment with sulfadoxine-pyrimethamine from southwest Nigeria.
Placenta
January 2025
Department of Pharmacology, Babcock University, Ilishan-Remo, Ogun, Nigeria; Centre for Advanced Medical Research and Biotechnology, Babcock University, Ilishan-Remo, Ogun, Nigeria.
Introduction: The genetic complexity of Plasmodium falciparum is contributory to the emergence of drug resistant-parasites. Intermittent preventive treatment of malaria in pregnancy with sulfadoxine-pyrimethamine (IPTp-SP) in malaria endemic settings is recommended by WHO. This study evaluated the prevalence of Plasmodium falciparum multidrug resistance-1 gene (Pfmdr-1), genetic diversity of merozoite surface proteins (msp-1, msp-2) and glutamate-rich protein (glurp) among pregnant women with sub-patent parasitaemia from southwest Nigeria.
View Article and Find Full Text PDFPlasmodium Falciparum and mosquito vector IgG patterns across suspected malaria cases in Ghana.
BMC Infect Dis
December 2024
Department of Immunology, Noguchi Memorial Institute for Medical Research, University of Ghana, Accra, Ghana.
Article Synopsis
- The study investigates malaria patterns and IgG antibody levels in suspected patients in Ghana, highlighting the disease's prevalence as a major health issue in the country.
- A total of 823 participants aged 1 to 85 were analyzed for antibody responses against various malaria proteins using ELISA, with significant findings indicating higher antibody levels with increasing age.
- Results show notable variations in antibody responses by region and age, particularly for proteins MSP3, GLURP-RO, and gSG6-P1, underscoring the need for targeted malaria control strategies.
Genotyping and Characterizing to Reveal Genetic Diversity and Multiplicity of Infection by Merozoite Surface Proteins 1 and 2 ( and ) and Glutamate-Rich Protein () Genes.
Trop Med Infect Dis
November 2024
School of Medicine, Pharmacy and Biomedical Sciences, University of Portsmouth, Portsmouth PO1 2DT, UK.
Resistance to current antimalarial drugs is steadily increasing, and new drugs are required. Drug efficacy trials remain the gold standard to assess the effectiveness of a given drug. The World Health Organization (WHO)'s recommendation for the optimal duration of follow-up for assessing antimalarial efficacy is a minimum of 28 days.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!