Rapid detection and quantification of Propionibacteriaceae.

Area of Science:

• Microbiology
• Molecular Diagnostics
• Infectious Diseases

Background:

• Propionibacteriaceae (Propioni) are anaerobic bacteria implicated in human and animal infections.
• Current diagnostic methods for Propioni infections lack sensitivity, are time-consuming (3-14 days), and present interpretation challenges.
• Existing diagnostic limitations necessitate the development of rapid and sensitive detection methods.

Purpose of the Study:

• To validate a novel, rapid, and sensitive diagnostic test for Propionibacteriaceae infections.
• To establish a new molecular assay for the early detection of Propioni in clinical samples.
• To improve the diagnosis of Propioni-associated conditions like endophthalmitis and corneal ulcers.

Main Methods:

• DNA extraction using the MagNA Pure isolation kit (Roche).
• Development and application of original primers and a probe for bacterial detection and quantification via real-time PCR.
• Utilized a PCR cycling program with specific temperature and time parameters for efficient amplification.

Main Results:

• The developed real-time PCR assay demonstrates high sensitivity, detecting as low as 0.01 Equivalent PFU/microl of Propioni.
• The test effectively detects Propioni in various matrices, including phosphate-buffered saline (PBS), aqueous humor, vitreous humor, and cell suspensions.
• Propionibacteriaceae were detected as single contaminants or in mixed infections with other microorganisms or human cells.

Conclusions:

• The new real-time PCR assay provides a rapid diagnostic solution for Propionibacteriaceae infections, with results available in under 1.5 hours.
• The assay achieves high sensitivity, detecting 0.01 Eq/CFU microl of Propioni in diverse biological samples.
• This validated method offers a significant improvement over traditional diagnostic techniques for Propioni detection.