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A new coccidian parasite (Apicomplexa: Eimeriidae) from humans

Y R Ortega1, R H Gilman, C R Sterling

  • 1Department of Veterinary Science, University of Arizona, Tucson 85721.

The Journal of Parasitology
|August 1, 1994
PubMed
Summary

A novel coccidian parasite, Cyclospora cayetanensis, was identified in human stool samples. This discovery advances understanding of human parasitic infections and their diagnosis.

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Area of Science:

  • Medical Parasitology
  • Microbiology
  • Infectious Diseases

Background:

  • Coccidian parasites are a significant cause of gastrointestinal illness worldwide.
  • Accurate identification of parasitic species is crucial for effective treatment and public health management.

Purpose of the Study:

  • To describe and classify a newly identified coccidian parasite found in human stool specimens.
  • To establish the morphological and ultrastructural characteristics of this novel parasite.

Main Methods:

  • Microscopic examination of stool specimens.
  • Oocyst and sporocyst measurements.
  • Electron microscopy for ultrastructural analysis.
  • Taxonomic classification based on morphological features.

Main Results:

  • A new coccidian parasite was detected in human stool samples from individuals with and without diarrhea.
  • Oocyst dimensions: 8.6 microns (7.7-9.9 microns).
  • Sporocyst dimensions: 4.0 x 6.3 microns (3.3-4.4 x 5.5-7.1 microns).
  • Each oocyst contained 2 sporocysts, with 2 sporozoites per sporocyst.
  • Electron microscopy confirmed unique structural characteristics.

Conclusions:

  • The identified parasite has been classified within the genus Cyclospora.
  • The new species is proposed to be named Cyclospora cayetanensis.
  • This finding contributes to the understanding of human-pathogenic coccidia.

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