Related Experiment Video
Updated: May 26, 2026
Label-Free Surface-Enhanced Raman Scattering Bioanalysis Based on Au@Carbon Dot Nanoprobes
Published on: June 9, 2023
Detection and differentiation of avian mycoplasmas by surface-enhanced Raman spectroscopy based on a silver nanorod
Suzanne L Hennigan1, Jeremy D Driskell, Naola Ferguson-Noel
1Department of Microbiology, University of Georgia, Athens, Georgia, USA.
Abstract:
Mycoplasma gallisepticum is a bacterial pathogen of poultry that is estimated to cause annual losses exceeding $780 million. The National Poultry Improvement Plan guidelines recommend regular surveillance and intervention strategies to contain M. gallisepticum infections and ensure mycoplasma-free avian stocks, but several factors make detection of M. gallisepticum and diagnosis of M. gallisepticum infection a major challenge. Current techniques are laborious, require special expertise, and are typically plagued by false results. In this study, we describe a novel detection strategy which uses silver nanorod array-surface-enhanced Raman spectroscopy (NA-SERS) for direct detection of avian mycoplasmas. As a proof of concept for use in avian diagnostics, we used NA-SERS to detect and differentiate multiple strains of avian mycoplasma species, including Acholeplasma laidlawii, Mycoplasma gallinarum, Mycoplasma gallinaceum, Mycoplasma synoviae, and M. gallisepticum, including vaccine strains 6/85, F, and ts-11. Chemometric multivariate analysis of spectral data was used to classify these species rapidly and accurately, with >93% sensitivity and specificity. Furthermore, NA-SERS had a lower limit of detection that was 100-fold greater than that of standard PCR and comparable to that of real-time quantitative PCR. Detection of M. gallisepticum in choanal cleft swabs from experimentally infected birds yielded good sensitivity and specificity, suggesting that NA-SERS is applicable for clinical detection.
Insights
A new silver nanorod array-surface-enhanced Raman spectroscopy (NA-SERS) method offers rapid and accurate detection of Mycoplasma gallisepticum, a poultry pathogen. This NA-SERS technique shows promise for improved avian diagnostics and surveillance.
Area of Science:
- Veterinary Microbiology
- Biosensing Technology
- Spectroscopy
Background:
- Mycoplasma gallisepticum causes significant economic losses in the poultry industry.
- Current diagnostic methods for M. gallisepticum are challenging, laborious, and prone to errors.
- Effective surveillance is crucial for controlling M. gallisepticum in avian populations.
Purpose of the Study:
- To develop and validate a novel, direct detection strategy for avian mycoplasmas using NA-SERS.
- To assess the capability of NA-SERS in differentiating various avian mycoplasma species and vaccine strains.
- To evaluate the diagnostic potential of NA-SERS for M. gallisepticum in clinical samples.
Main Methods:
- Utilized silver nanorod array-surface-enhanced Raman spectroscopy (NA-SERS) for direct detection.
- Applied chemometric multivariate analysis for spectral data classification.
- Compared NA-SERS performance against standard and real-time quantitative PCR.
- Tested NA-SERS on choanal cleft swabs from experimentally infected birds.
Main Results:
- NA-SERS successfully detected and differentiated multiple avian mycoplasma species, including M. gallisepticum strains.
- Achieved >93% sensitivity and specificity in species classification using chemometric analysis.
- Demonstrated a lower limit of detection 100-fold better than standard PCR.
- Showed good sensitivity and specificity for M. gallisepticum detection in clinical avian samples.
Conclusions:
- NA-SERS provides a rapid, sensitive, and specific method for avian mycoplasma detection.
- This technique offers a significant advancement over existing diagnostic tools for M. gallisepticum.
- NA-SERS is a promising technology for routine avian diagnostics and disease surveillance.
