Bovine mastitis bacteria resolved by MALDI-TOF mass spectrometry

Area of Science:

• Microbiology
• Veterinary Science
• Analytical Chemistry

Background:

• Bovine mastitis is a significant concern in dairy farming, impacting animal health and milk production.
• Accurate and rapid identification of causative pathogens is crucial for effective treatment and control strategies.
• Matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) offers a promising approach for microbial identification.

Purpose of the Study:

• To expand a commercial MALDI-TOF MS database with additional bacterial species relevant to bovine mastitis.
• To evaluate the efficacy of the amended database in identifying bacterial pathogens causing bovine mastitis.
• To characterize the diversity of bacterial species involved in bovine mastitis.

Main Methods:

• 500 udder pathogenic bacterial isolates were analyzed using MALDI-TOF MS.
• A commercial MALDI-TOF MS database was amended with new species' mass spectra.
• Conventional methods and 16S rDNA sequencing were used for isolates with genus-level identification.

Main Results:

• MALDI-TOF MS successfully identified 93.5% of isolates to the species level and 6.5% to the genus level.
• The study identified a total of 24 genera and 61 species, predominantly staphylococci, streptococci, Enterobacteriaceae, and coryneform bacteria.
• The expanded database demonstrated improved identification capabilities for bovine mastitis pathogens.

Conclusions:

• MALDI-TOF MS is a powerful, rapid, and reliable technique for identifying common bovine mastitis-causing microorganisms.
• Continuous expansion and improvement of the MALDI-TOF MS database enhance its diagnostic utility.
• Accurate pathogen identification using MALDI-TOF MS aids in managing and controlling bovine mastitis.