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Updated: May 30, 2025
Optimized PCR-based Detection of Mycoplasma
Published on: June 20, 2011
Development and evaluation of optimized PCR and indirect ELISA for the detection of Morganella morganii in dairy cows
Meihua Zhang1, Jiayi Li2, Jianfeng Xue3
1College of Veterinary Medicine, Shandong Agricultural University, Tai'an, China.
Introduction:
Morganella morganii (M. morganii) is a Gram-negative opportunistic pathogen, whose increasing virulence and antibiotic resistance negatively impact dairy cow health and productivity, raising concerns in livestock health management. To mitigate this risk, rapid and reliable diagnostic methods for detection are essential. Currently, detection methods for M. morganii are underdeveloped, prompting us to develop both pathogenic and serological detection methods, including an optimized PCR technique and an indirect enzyme-linked immunosorbent assay (I-ELISA).
Methods:
The optimized PCR method utilized bacterial suspensions directly as templates, bypassing the need for DNA extraction and thereby allowing the direct detection of M. morganii in fecal samples. Primer concentrations and annealing temperatures were optimized to minimize primer dimer formation, ensuring high specificity. Clinical evaluation was conducted using 771 fecal and nasal fluid samples collected from dairy farms in five regions. The I-ELISA method was developed using M. morganii lipoprotein (LPP) antigen. Parameters such as antigen coating, blocking conditions, and antibody dilution were optimized to improve specificity. Stability and reproducibility were validated through intra- and inter-assay tests. A total of 476 serum samples from dairy cows were tested to assess the method's clinical applicability.
Results:
The optimized PCR method demonstrated high sensitivity and specificity, achieving a detection threshold of 0.2 CFU/μL. Clinical testing revealed a positivity rate of 1.4% among 771 fecal and nasal fluid samples. The I-ELISA method showed excellent stability and reproducibility, confirmed through intra- and inter-assay consistency. In testing 476 dairy cow serum samples, the positivity rate for M. morganii was 5.9%. These results indicate the utility of I-ELISA as a reliable serological diagnostic tool.
Discussion:
The PCR and I-ELISA methods collectively offer practical solutions for the early clinical diagnosis of M. morganii infections in dairy cows. The PCR technique's efficiency and sensitivity make it ideal for pathogen detection in fecal samples, while the I-ELISA method provides a robust platform for serological analysis. Together, these tools enable timely intervention, contributing to improved livestock health management and mitigating the negative impacts of M. morganii on dairy cow productivity. Future research may focus on further refining these techniques and exploring their applications in broader livestock management contexts.
Insights
Rapid diagnostic methods for Morganella morganii (M. morganii) in dairy cows were developed. Optimized PCR and I-ELISA offer efficient detection, aiding livestock health management and productivity.
Area of Science:
- Veterinary Microbiology
- Livestock Health Management
- Diagnostic Assay Development
Background:
- Morganella morganii (M. morganii) poses a growing threat to dairy cow health due to increasing virulence and antibiotic resistance.
- Current diagnostic methods for M. morganii are insufficient for effective livestock health management.
- Early detection is crucial to mitigate the negative impacts of M. morganii on dairy cow productivity.
Purpose of the Study:
- To develop and optimize rapid and reliable diagnostic methods for M. morganii detection in dairy cows.
- To establish an optimized Polymerase Chain Reaction (PCR) technique for direct pathogen detection.
- To create a sensitive and specific indirect Enzyme-Linked Immunosorbent Assay (I-ELISA) for serological diagnosis.
Main Methods:
- An optimized PCR method was developed using bacterial suspensions directly, eliminating DNA extraction for M. morganii detection in fecal samples.
- An indirect Enzyme-Linked Immunosorbent Assay (I-ELISA) was established using M. morganii lipoprotein (LPP) antigen, with optimized parameters for specificity and stability.
- Clinical evaluation involved testing 771 fecal and nasal fluid samples with PCR and 476 serum samples with I-ELISA from dairy cows across five regions.
Main Results:
- The optimized PCR method achieved a detection limit of 0.2 CFU/μL with high sensitivity and specificity, identifying M. morganii in 1.4% of tested samples.
- The I-ELISA demonstrated excellent stability and reproducibility, detecting M. morganii in 5.9% of dairy cow serum samples.
- Both methods proved effective for clinical diagnosis, with PCR suitable for direct pathogen detection and I-ELISA for serological screening.
Conclusions:
- The developed PCR and I-ELISA methods provide practical and efficient tools for early clinical diagnosis of M. morganii infections in dairy cows.
- These diagnostic advancements support timely intervention, enhancing livestock health management and dairy cow productivity.
- Further refinement and broader application of these techniques in livestock management are warranted.
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