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Plasmodium malariae blood-stage dynamics.

F E McKenzie1, G M Jeffery, W E Collins

  • 1Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, Massachusetts 02138, USA.

The Journal of Parasitology
|June 28, 2001
PubMed
Summary
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This study analyzed Plasmodium malariae infections in neurosyphilis patients, finding fever patterns sometimes matched brood structures but not textbook quartan malaria. Gametocytemia patterns were unclear, though transmission to mosquitoes increased after drug treatment.

Area of Science:

  • Medical Parasitology
  • Infectious Diseases
  • Clinical Microbiology

Background:

  • Malariatherapy was historically used to treat neurosyphilis.
  • Understanding Plasmodium malariae infection dynamics is crucial for historical and potential future therapeutic applications.

Purpose of the Study:

  • To analyze the clinical dynamics of Plasmodium malariae infection in neurosyphilis patients.
  • To investigate patterns of parasitemia, fever, and gametocytemia during malariatherapy.
  • To assess factors influencing Plasmodium malariae transmission to mosquitoes.

Main Methods:

  • Retrospective analysis of clinical charts from 180 malaria-naive U.S. neurosyphilis patients infected with Plasmodium malariae.
  • Focus on 84 charts with >35 days of infection and >92% daily record coverage.

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  • Examination of fever patterns, parasitemia peaks, and gametocytemia levels.

    • Main Results:

    • Inoculum size did not affect outcome variables.
    • Fever patterns showed some resemblance to brood structures but not textbook quartan malaria.
    • No discernible patterns were observed in gametocytemia.
    • Subcurative drug treatment increased successful transmission to mosquitoes, independent of detectable gametocytemia.

    Conclusions:

    • Plasmodium malariae infection dynamics in malariatherapy patients exhibit complex patterns not fully aligning with classical descriptions.
    • Fever patterns offer potential insights into parasite cycles, while gametocytemia remains difficult to predict.
    • Drug treatment can enhance vector infectivity, highlighting transmission risks even without high gametocytemia.