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Updated: Jul 11, 2026
Optimized PCR-based Detection of Mycoplasma
Published on: June 20, 2011
A real-time PCR assay for detection and quantification of Mycoplasma agalactiae DNA
1Department of Animal Health and Well-being, Faculty of Veterinary Medicine of Bari, Valenzano (Bari), Italy.
Aims:
The aim of this study was to develop a rapid, sensitive, specific tool for detection and quantification of Mycoplasma agalactiae DNA in sheep milk samples.
Methods And Results:
A real-time polymerase chain reaction (PCR) assay targeting the membrane-protein 81 gene of M. agalactiae was developed. The assay specifically detected M. agalactiae DNA without cross-amplification of other mycoplasmas and common pathogens of small ruminants. The method was reproducible and highly sensitive, providing precise quantification of M. agalactiae DNA over a range of nine orders of magnitude. Compared with an established PCR assay, the real-time PCR was one-log more sensitive, detecting as few as 10(1) DNA copies per 10 microl of plasmid template and 6.5x10(0) colour changing units of reference strain Ba/2.
Conclusions:
The real-time PCR assay is a reliable method for the detection and quantification of M. agalactiae DNA in sheep milk samples. The assay is more sensitive than gel-based PCR protocols and provides quantification of the M. agalactiae DNA contained in milk samples. The assay is also quicker than traditional culture methods (2-3 h compared with at least 1 week).
Significance And Impact Of The Study:
The established real-time PCR assay will help study the patterns of shedding of M. agalactiae in milk, aiding pathogenesis and vaccine efficacy studies.
