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Symbiosis

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Symbiotic relationships are long-term, close interactions between individuals of different species that affect the distribution and abundance of those species. When a relationship is beneficial to both species, this is called mutualism. When the relationship is beneficial to one species but neither beneficial nor harmful to the other species, this is called commensalism. When one organism is harmed to benefit another, the relationship is known as parasitism. These types of relationships often...
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Artemisinin-resistant malaria.

N J White1,2, K Chotivanich1,3

  • 1Mahidol Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand.

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Artemisinin resistance in Plasmodium falciparum malaria is spreading globally, threatening treatment efficacy. Strategies to combat this include deploying triple artemisinin combination therapies and reducing monotherapy use.

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Area of Science:

  • Tropical Medicine
  • Infectious Diseases
  • Parasitology

Background:

  • Artemisinin antimalarials are crucial for malaria treatment.
  • Artemisinin resistance in Plasmodium falciparum is a growing global concern.
  • Resistance has spread from Southeast Asia to South America and East Africa.

Purpose of the Study:

  • To review the current status and implications of artemisinin resistance in Plasmodium falciparum.
  • To highlight the genetic basis and clinical manifestations of artemisinin resistance.
  • To discuss strategies for managing and delaying the emergence of higher resistance levels.

Main Methods:

  • Review of scientific literature on artemisinin resistance.
  • Analysis of geographical spread and genetic mutations associated with resistance.
  • Evaluation of clinical impact on treatment outcomes and public health.

Main Results:

  • Artemisinin resistance is linked to mutations in the PfKelch gene.
  • Resistance leads to reduced efficacy against ring-stage parasites and slower parasite clearance.
  • Resistance has emerged in new geographical areas, including East Africa.
  • Reduced gametocytocidal activity impacts malaria transmission.

Conclusions:

  • Artemisinin resistance poses a significant threat to malaria control efforts.
  • Maintaining high cure rates for artemisinin-based combination therapies (ACTs) is essential.
  • Strategies like triple ACTs and judicious use of antimalarials are needed to preserve treatment efficacy.
  • Improved diagnostics for hyperparasitemia are required for high-risk patients.