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Video:Malaria drug resistance

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Description

Drug-resistant malaria is a growing global health crisis where the Plasmodium parasites(P. falciparum, P. Vivax) develop genetic mutations that render common antimalarial drugs ineffective. This led to widespread resistance to older drugs like chloroquine and sulfadoxine/pyrimethamine. The current major concern is emergence of partial resistance to artemisinins, a component of first-line Artemisinin-based combination therapies , which is characterized by a delayed parasite clearance time. This resistance first emerged in Southeast Asia and has been detected and is spreading in several countries in Africa, where the majority of global malaria cases occur. The spread of drug resistance threatens to reverse decades of progress in malaria control.[1][2][3][4]

Presentation

In terms of the presentation , we find it is the same except for recrudescence: [5][6] fever , chills and malaise.

Risk factors

Among the risk factors for acquiring Malaria drug resistance are:[7] monotherapy use of artemisinin or other antimalarials alone accelerates resistance development and population mobility of infected individuals can spread resistant strains across regions.

Mechanism

Malaria drug resistance comes from genetic mutations in the Plasmodium species that alter drug targets, or enhance stress tolerance. Among mechanisms include mutations in the pfcrt and pfmdr1 genes(chloroquine resistance), dhfr and dhps(antifolate resistance), and kelch13(artemisinin resistance), which help parasites to survive treatment by modifying protein synthesis, or delaying clearance. Recent findings also indicate translational reprogramming via tRNA modifications in response to artemisinin, underscoring the parasites adaptive plasticity.[8][9][10]

Diagnosis

In terms of diagnosing malaria drug resistance relies on these methods: [11][12][13] In Vivo Therapeutic Efficacy Studies which involve direct monitoring of a individuals clinical and parasitological response to treatment over several weeks, secondly Molecular Characterization which uses PCR and gene sequencing to identify known genetic mutations in the parasites DNA that are associated with resistance to specific drugs and finally, In Vitro Susceptibility Assays which are laboratory tests that culture parasites from a individuals blood with varying drug concentrations to directly measure the parasite sensitivity to medication.

Treatment

As to management we find that when malaria becomes drug-resistant,especially to artemisinin,treatment shifts to alternative artemisinin-based combination therapies, or to triple ACTs in high-resistance areas. For Plasmodium falciparum, options include artesunate-mefloquine or dihydroartemisinin-piperaquine, while chloroquine-resistant P. vivax is treated with ACTs plus primaquine . Severe cases rely on intravenous artesunate followed by oral ACTs; treatment decisions depend on local resistance patterns.[14][15][16]

Epidemiology

As to the epidemiology we find that Artemisinin resistance (ART-R) was first confirmed along the Thailand-Cambodia border in the Greater Mekong Subregion around 2008 and has since spread across the GMS(including Myanmar, Vietnam, and Laos). This region remains a hotspot, often demonstrating resistance to both artemisinin and the partner drugs. We find that Africa and South America have developed Artemisinin resistance also.[17][18][19][20]

History

In terms of history we find that Dr. Arjen Dondorp(from Mahidol-Oxford Tropical Medicine Research Unit), led clinical studies in Cambodia that first documented delayed parasite clearance,a hallmark of artemisinin resistance.Dr. Didier Ménard (from Institut Pasteur Cambodia) identified Kelch13 mutations as molecular markers of artemisinin resistance.[2][21]

Research

In terms of research we find that Drexel and Columbia researchers have mapped the 3D structure of PfATP4 and identified a new binding partner, potentially guiding the design of more robust inhibitors that bypass current resistance mechanisms.[22]

References

  1. ↑ "WHO guidelines for malaria". www.who.int. Archived from the original on 18 March 2023. Retrieved 18 October 2025.
  2. ↑ 2.0 2.1 Ariey, Frédéric; Witkowski, Benoit; Amaratunga, Chanaki; Beghain, Johann; Langlois, Anne-Claire; Khim, Nimol; Kim, Saorin; Duru, Valentine; Bouchier, Christiane; Ma, Laurence; Lim, Pharath; Leang, Rithea; Duong, Socheat; Sreng, Sokunthea; Suon, Seila; Chuor, Char Meng; Bout, Denis Mey; Ménard, Sandie; Rogers, William O.; Genton, Blaise; Fandeur, Thierry; Miotto, Olivo; Ringwald, Pascal; Le Bras, Jacques; Berry, Antoine; Barale, Jean-Christophe; Fairhurst, Rick M.; Benoit-Vical, Françoise; Mercereau-Puijalon, Odile; Ménard, Didier (2 January 2014). "A molecular marker of artemisinin-resistant Plasmodium falciparum malaria". Nature. 505 (7481): 50–55. Bibcode:2014Natur.505...50A. doi:10.1038/nature12876. ISSN 1476-4687. PMC 5007947. PMID 24352242.
  3. ↑ "Strategy to respond to antimalarial drug resistance in Africa". www.who.int. Archived from the original on 22 September 2025. Retrieved 18 October 2025.
  4. ↑ Sinha, Shweta; Medhi, Bikash; Sehgal, Rakesh (2014). "Challenges of drug-resistant malaria". Parasite (Paris, France). 21: 61. doi:10.1051/parasite/2014059. ISSN 1776-1042. PMC 4234044. PMID 25402734.
  5. ↑ Kalra, S. P.; Naithani, N.; Mehta, S. R.; Kumar, Rajat (July 2002). "Resistant Malaria : Current Concepts and Therapeutic Strategies". Medical Journal, Armed Forces India. 58 (3): 228–233. doi:10.1016/S0377-1237(02)80136-8. ISSN 0377-1237. PMC 4925349. PMID 27407388.
  6. ↑ "Fact sheet about malaria". www.who.int. Archived from the original on 2 May 2020. Retrieved 31 October 2025.
  7. ↑ "ANTIMICROBIAL RESISTANCE AND MALARIA". WHO. Retrieved 21 October 2025.
  8. ↑ Small-Saunders, Jennifer L.; Sinha, Ameya; Bloxham, Talia S.; Hagenah, Laura M.; Sun, Guangxin; Preiser, Peter R.; Dedon, Peter C.; Fidock, David A. (June 2024). "tRNA modification reprogramming contributes to artemisinin resistance in Plasmodium falciparum". Nature Microbiology. 9 (6): 1483–1498. doi:10.1038/s41564-024-01664-3. ISSN 2058-5276. PMC 11153160. PMID 38632343.
  9. ↑ Patel, Chirag A.; Pande, Sonal; Shukla, Priya; Ranch, Ketan; Al-Tabakha, Moawia M.; Boddu, Sai H. S. (2023). "Antimalarial Drug Resistance: Trends, Mechanisms, and Strategies to Combat Antimalarial Resistance". Malarial Drug Delivery Systems: Advances in Treatment of Infectious Diseases. Springer International Publishing. pp. 43–69. doi:10.1007/978-3-031-15848-3_3. ISBN 978-3-031-15848-3.
  10. ↑ Ross, Leila S.; Fidock, David A. (10 July 2019). "Elucidating Mechanisms of Drug-Resistant Plasmodium falciparum". Cell Host & Microbe. 26 (1): 35–47. doi:10.1016/j.chom.2019.06.001. ISSN 1931-3128. PMID 31295423. Retrieved 30 October 2025.
  11. ↑ Vestergaard, Lasse S.; Ringwald, Pascal (December 2007). "Responding to the Challenge of Antimalarial Drug Resistance by Routine Monitoring to Update National Malaria Treatment Policies". Defining and Defeating the Intolerable Burden of Malaria III: Progress and Perspectives: Supplement to Volume 77(6) of American Journal of Tropical Medicine and Hygiene. American Society of Tropical Medicine and Hygiene. Archived from the original on 2025-04-15. Retrieved 2025-10-25.
  12. ↑ "Antimalarial Drug Resistance Testing". Malaria. 15 July 2024. Archived from the original on 28 August 2025. Retrieved 25 October 2025.
  13. ↑ "Monitoring malaria drug efficacy and resistance". www.who.int. Archived from the original on 11 June 2025. Retrieved 25 October 2025.
  14. ↑ "Strategy to respond to antimalarial drug resistance in Africa". www.who.int. Archived from the original on 22 September 2025. Retrieved 26 October 2025.
  15. ↑ Chakrabarti, Amrita; Singh, Vigyasa; Singh, Shailja (2019). "Management and Control of Antimalarial Drug Resistance". Bacterial Adaptation to Co-resistance. Springer. pp. 297–322. doi:10.1007/978-981-13-8503-2_15. ISBN 978-981-13-8503-2. Retrieved 30 October 2025.
  16. ↑ "Malaria: Artemisinin partial resistance". www.who.int. Archived from the original on 22 September 2025. Retrieved 2 November 2025.
  17. ↑ Balmer, Andrew J.; White, Nina F. D.; Ünlü, Eyyüb S.; Lee, Chiyun; Pearson, Richard D.; Almagro-Garcia, Jacob; Ariani, Cristina V. (2024-08-24), Understanding the Global Spread of Artemisinin Resistance: Insights from over 100K Plasmodium falciparum Samples, doi:10.1101/2024.08.23.609367
  18. ↑ "The global challenge of antimalarial drug resistance: From past to present". www.lshtm.ac.uk. Retrieved 20 October 2025.
  19. ↑ Rosenthal, Philip J.; Asua, Victor; Bailey, Jeffrey A.; Conrad, Melissa D.; Ishengoma, Deus S.; Kamya, Moses R.; Rasmussen, Charlotte; Tadesse, Fitsum G.; Uwimana, Aline; Fidock, David A. (1 September 2024). "The emergence of artemisinin partial resistance in Africa: how do we respond?". The Lancet Infectious Diseases. 24 (9): e591 – e600. doi:10.1016/S1473-3099(24)00141-5. ISSN 1473-3099. PMID 38552654. Archived from the original on 14 November 2024. Retrieved 3 November 2025.
  20. ↑ White, N. J.; Chotivanich, K. (15 October 2024). "Artemisinin-resistant malaria". Clinical Microbiology Reviews. 37 (4): e00109–24. doi:10.1128/cmr.00109-24. PMC 11629630. PMID 39404268.
  21. ↑ Dondorp, Arjen M.; Fairhurst, Rick M.; Slutsker, Laurence; MacArthur, John R.; M.D, Joel G. Breman; Guerin, Philippe J.; Wellems, Thomas E.; Ringwald, Pascal; Newman, Robert D.; Plowe, Christopher V. (22 September 2011). "The Threat of Artemisinin-Resistant Malaria". New England Journal of Medicine. 365 (12): 1073–1075. doi:10.1056/NEJMp1108322. ISSN 0028-4793. PMC 3733336. PMID 21992120.
  22. ↑ Timothy, Francisca Magum; Zininga, Tawanda (1 October 2025). "Comparative Characterization of Plasmodium falciparum Small Heat Shock Proteins and Their Inhibition by Quercetin (3,3′,4′,5,7-Pentahydroxyflavone)". The Protein Journal. 44 (5): 580–597. doi:10.1007/s10930-025-10281-w. ISSN 1875-8355. PMC 12457548. PMID 40681790.
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