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Immune response pattern in recurrent Plasmodium vivax malaria.

Yury Oliveira Chaves1, Allyson Guimarães da Costa2,3,4, Marcelo Luís Monteiro Pereira5

  • 1Instituto Leônidas e Maria Deane, Fundação Oswaldo Cruz (FIOCRUZ), Manaus, AM, Brazil.

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Summary

Plasmodium vivax malaria reduces white blood cells and lymphocytes, especially in recurrent cases. Recurrent malaria is linked to an imbalanced CD4(+)/CD8(+) T-cell ratio and elevated IL-10 levels, indicating immune response remodeling.

Keywords:
CD4+ T-cellsCD8+ T-cellsInterleukin-10MalariaPlasmodium vivaxRecurrence

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Area of Science:

  • Immunology
  • Infectious Diseases
  • Tropical Medicine

Background:

  • Plasmodium vivax is a widespread cause of malaria, responsible for approximately 70% of cases in Brazil.
  • Understanding the immune response to P. vivax is crucial, particularly differentiating primary from recurrent infections.

Purpose of the Study:

  • To investigate the immune response patterns in primary versus recurrent Plasmodium vivax malaria.
  • To compare leukocyte subsets and cytokine profiles in malaria patients against endemic controls.

Main Methods:

  • A cross-sectional study in Manaus, Brazil, included 36 primary malaria, 19 recurrent malaria, and 20 control patients.
  • Ex vivo analysis of circulating leukocyte subsets (CD4+ T-cells, CD8+ T-cells, NK, NKT, B, B1, Treg) and plasma cytokines (IL-2, IL-4, IL-6, IL-10, TNF, IFN-γ).

Main Results:

  • Malaria patients showed reduced white blood cells and lymphocyte subsets compared to controls.
  • Recurrent malaria patients exhibited a decreased proportion of CD4+ and CD8+ T-cells.
  • Both malaria groups displayed elevated plasma cytokine levels, indicative of a cytokine storm, with recurrent malaria showing higher IL-10.

Conclusions:

  • P. vivax infection decreases peripheral blood lymphocyte subsets, with this effect intensified in recurrent malaria.
  • An unbalanced CD4(+)/CD8(+) T-cell ratio and increased IL-10 correlate with recurrent malaria episodes.
  • Repeated exposure to P. vivax remodels the immune response, involving CD4(+)/CD8(+) T-cell imbalance and heightened IL-10 secretion.