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Detecting Cryptosporidium in Stool Samples Submitted to a Reference Laboratory.

Kimberly Mergen¹, Noel Espina¹, Allen Teal¹

¹1Parasitology Laboratory, Wadsworth Center, NYSDOH, Albany, New York.

The American Journal of Tropical Medicine and Hygiene

|May 28, 2020

Summary

A new real-time polymerase chain reaction (RT-PCR) test accurately detects Cryptosporidium in patient samples. This molecular method is more sensitive and efficient than traditional microscopy and antigen tests for public health laboratories.

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Area of Science:

Clinical microbiology
Molecular diagnostics
Parasitology

Background:

Microscopy is the traditional method for Cryptosporidium detection but is labor-intensive and has limitations in sensitivity.
Antigen-based and molecular methods offer improved detection levels and reduced hands-on time for clinical laboratories.

Purpose of the Study:

To develop and validate a real-time polymerase chain reaction (RT-PCR) laboratory-developed test (LDT) for the detection of Cryptosporidium species.
To compare the diagnostic performance of the RT-PCR LDT against microscopy, antigen tests, and a commercial gastrointestinal panel.

Main Methods:

Development and validation of a novel RT-PCR assay for detecting Cryptosporidium hominis, Cryptosporidium parvum, and other Cryptosporidium species.
Comparative analysis of the RT-PCR LDT with modified acid-fast microscopy, immunofluorescent microscopy, an antigen-based rapid test, and a commercial gastrointestinal panel using 40 positive patient samples.

Main Results:

The RT-PCR LDT successfully detected Cryptosporidium in all 40 positive samples.
Microscopy and antigen-based methods detected Cryptosporidium in only 20 and 21 samples, respectively.
The commercial gastrointestinal panel detected 33 of the 40 positive samples, demonstrating superior performance over microscopy and antigen tests.

Conclusions:

The developed RT-PCR LDT is a highly accurate and reliable method for Cryptosporidium detection in clinical public health laboratories.
The molecular test offers significant advantages in sensitivity and efficiency compared to conventional diagnostic methods.
The RT-PCR LDT is a cost-effective solution for improving Cryptosporidium diagnostics in reference laboratories.