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Magnetic immuno capture PCR assay (MIPA): detection of Leptospira borgpetersenii serovar hardjo
M J Taylor1, W A Ellis, J M Montgomery
1Department of Agriculture for Northern Ireland, Veterinary Sciences Division, Belfast, UK.
Abstract:
Magnetic immuno PCR assay (MIPA) was developed for the rapid detection of leptospires excreted in urine samples (n = 59) collected from 35 experimentally infected cattle. The immunomagnetic separation of leptospires from inhibitors in frozen formalin fixed bovine urine prior to PCR detection resulted in a marked improvement on previous detection methods. MIPA is a rapid 5 step protocol requiring 70 mins preparation time prior to amplification, which consistently detects 10(1) organisms. MIPA detected 76% (38/50) of culture positive urines and in addition three urines that were culture negative were shown to be positive by this method of detection. Consequently we conclude that whilst MIPA is an improvement on previously published PCR detection methods, the culture of the organism is still the standard against which other detection methods have to be compared.
Insights
A new Magnetic Immuno PCR Assay (MIPA) offers rapid detection of leptospires in cattle urine. This improved method enhances sensitivity and speed compared to traditional techniques.
Area of Science:
- Veterinary microbiology
- Molecular diagnostics
- Bovine infectious diseases
Background:
- Leptospirosis is a significant zoonotic disease in cattle, posing risks to animal health and human populations.
- Accurate and rapid detection of leptospires in bovine urine is crucial for disease control and management.
- Existing diagnostic methods for bovine leptospirosis can be time-consuming or lack sensitivity.
Purpose of the Study:
- To develop and evaluate a Magnetic Immuno PCR Assay (MIPA) for the rapid detection of leptospires in bovine urine.
- To assess the performance of MIPA compared to traditional culture methods.
- To determine the potential of MIPA for early and sensitive diagnosis of leptospiral shedding in cattle.
Main Methods:
- Development of a Magnetic Immuno PCR Assay (MIPA) incorporating immunomagnetic separation.
- Application of MIPA to analyze urine samples (n=59) from experimentally infected cattle (n=35).
- Comparison of MIPA results with conventional culture techniques for leptospire detection.
Main Results:
- MIPA demonstrated a rapid 70-minute preparation time prior to amplification.
- The assay consistently detected as few as 10(1) leptospiral organisms.
- MIPA identified 76% of culture-positive urines and detected leptospires in three culture-negative samples.
Conclusions:
- Magnetic Immuno PCR Assay (MIPA) represents a significant advancement over previous PCR detection methods for bovine leptospirosis.
- MIPA offers improved sensitivity and speed for detecting leptospires in cattle urine.
- While MIPA shows promise, culture remains the gold standard for comparison in diagnosing leptospiral infections.