Effective concentration and detection of cryptosporidium, giardia, and the microsporidia from environmental matrices
Joseph A Moss1, John Gordy2, Richard A Snyder1
1Center for Environmental Diagnostics and Bioremediation, University of West Florida, 11,000 University Parkway, Building 58, Room 70, Pensacola, FL 32514, USA.
Abstract:
Cryptosporidium spp., Giardia spp., and members of Microsporidia are enteropathogenic parasites of humans and animals, producing asymptomatic to severe intestinal infections. To circumvent various impediments associated with current detection methods, we tested a method providing multistage purification and separation in a single, confined step. Standard real-time PCR was used as a detection method. Samples spiked with C. parvum and G. intestinalis were split for comparison to standard Method 1623. Results were equivalent to immunomagnetic procedures for Cryptosporidium, and Giardia. Overall percent recovery for Cryptosporidium with Method 1623 averaged 26.89% (std 21.44%; min = 0%; max = 73%) and was similar but less variable for qPCR method at an estimated average of 27.67 (std 17.65%; min = 5%; max = 63%). For Giardia, Method 1623 had an overall average recovery of 27.11% (std 17.98%; min = 1%; max = 58%), while multistage purification and qPCR had an estimated lower overall recovery at 18.58% (std 13.95%; min = 0%; max = 35%). Microsporidia were also readily detected with an estimated recovery of 46.81% overall (std 17.66%; min = 18%; max = 70%) for E. intestinalis and 38.90% (std 14.36%; min = 13%; max = 62%) for E. bieneusi.
Insights
A new single-step purification method effectively detects enteropathogenic parasites like Cryptosporidium and Giardia using real-time PCR. This approach offers comparable recovery rates to standard methods, improving parasite detection in clinical and environmental samples.
Area of Science:
- Medical Parasitology
- Molecular Diagnostics
- Environmental Health
Background:
- Enteropathogenic parasites such as Cryptosporidium spp., Giardia spp., and Microsporidia cause significant human and animal intestinal infections.
- Current detection methods face various impediments, necessitating innovative approaches for accurate and efficient diagnosis.
Purpose of the Study:
- To evaluate a novel multistage purification and separation method for detecting enteropathogenic parasites.
- To compare the efficacy of this new method with standard diagnostic techniques, specifically Method 1623 and immunomagnetic procedures.
Main Methods:
- A single, confined step was developed for multistage purification and separation of parasitic DNA.
- Standard real-time PCR (qPCR) was employed as the detection technique.
- Samples spiked with Cryptosporidium parvum and Giardia intestinalis were analyzed and compared to results from Method 1623.
Main Results:
- The qPCR method demonstrated recovery rates for Cryptosporidium comparable to standard methods, with less variability.
- For Giardia, the multistage purification and qPCR method showed a lower overall recovery compared to Method 1623.
- Microsporidia, including E. intestinalis and E. bieneusi, were readily detected with estimated recovery rates of 46.81% and 38.90%, respectively.
Conclusions:
- The developed multistage purification and real-time PCR method provides a viable alternative for detecting Cryptosporidium, Giardia, and Microsporidia.
- While recovery rates for Giardia were lower than Method 1623, the method's efficiency in a single step and detection of Microsporidia warrant further investigation.
- This technique has the potential to overcome limitations of current diagnostic tools for these important enteropathogens.
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