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Laboratory diagnosis of Cyclospora infections
M L Eberhard1, N J Pieniazek, M J Arrowood
1Division of Parasitic Diseases, Centers for Disease Control and Prevention, Atlanta, Ga. 30341-3724, USA.
Abstract:
The laboratory diagnosis of newly recognized infectious agents, such as Cyclospora cayetanensis, is frequently problematic because appropriate diagnostic techniques and algorithms are not available. The methods currently available for diagnosis of Cyclospora are described and compared, including concentration procedures, examination of wet preparations, various staining techniques, and the use of molecular-based assays. Because of the autofluorescent properties of the oocysts, particular attention is drawn to the role of fluorescent microscopy in providing a rapid, inexpensive, and sensitive technique for diagnosis of Cyclospora infections in stool samples. In addition to text descriptions, photomicrographs are provided to illustrate Cyclospora oocysts in wet and stained preparations and compare them with Cryptosporidium and Isospora oocysts, the other two most common coccidian infections in man.
Insights
Diagnosing Cyclospora cayetanensis infections is challenging due to limited methods. Fluorescent microscopy offers a rapid, sensitive, and cost-effective approach for identifying Cyclospora oocysts in stool samples.
Area of Science:
- Medical Parasitology
- Infectious Diseases
- Diagnostic Microbiology
Background:
- Laboratory diagnosis of emerging infectious agents like Cyclospora cayetanensis presents challenges.
- Current diagnostic techniques and algorithms for Cyclospora are often inadequate.
- Accurate identification of Cyclospora is crucial for effective patient management.
Purpose of the Study:
- To describe and compare available diagnostic methods for Cyclospora.
- To highlight the utility of fluorescent microscopy for Cyclospora detection.
- To provide visual comparisons with other common coccidian oocysts.
Main Methods:
- Review and comparison of existing Cyclospora diagnostic techniques.
- Description of concentration procedures and wet preparation examinations.
- Evaluation of various staining techniques and molecular assays.
- Emphasis on fluorescent microscopy due to oocyst autofluorescence.
Main Results:
- Fluorescent microscopy is a rapid, inexpensive, and sensitive diagnostic tool for Cyclospora.
- Photomicrographs illustrate Cyclospora oocysts in different preparations.
- Comparison images differentiate Cyclospora from Cryptosporidium and Isospora.
Conclusions:
- Fluorescent microscopy is a valuable method for diagnosing Cyclospora infections.
- Improved diagnostic algorithms are needed for newly recognized infectious agents.
- Visual aids enhance the understanding and differentiation of coccidian oocysts.