Understanding the ambiguity behind Enterococcus as a probiotic ally or a pathogenic adversary

Area of Science:

• Microbiology
• Food Science
• Clinical Medicine

Background:

• Enterococci exhibit a dual role, serving as probiotics in fermented foods and opportunistic pathogens in healthcare settings.
• Traditional use in artisanal dairy products highlights their contribution to flavor, while some strains produce beneficial bacteriocins.
• Increasing antimicrobial resistance drives interest in bacteriocins as antibiotic alternatives.

Purpose of the Study:

• To review the defining characteristics of Enterococcus species to understand their dual nature.
• To establish a universal method for the safe and effective characterization of probiotic Enterococcus strains.
• To differentiate between probiotic and pathogenic Enterococcus lineages.

Main Methods:

• Literature review focusing on the genetic and metabolic characteristics of Enterococcus species.
• Analysis of studies on bacteriocin production and antimicrobial resistance.
• Examination of research clarifying divergent evolutionary paths of pathogenic and probiotic strains.

Main Results:

• Enterococci possess genes for potentially harmful enzymes but are vital for artisanal dairy product flavor.
• Certain strains produce bacteriocins, which are explored as alternatives to antibiotics due to rising antimicrobial resistance.
• Recent studies have identified distinct lineages responsible for probiotic versus nosocomial (hospital-acquired) pathogenicity.

Conclusions:

• Differentiating Enterococcus strains based on their genetic lineages is crucial for safe probiotic application.
• Insights aid in developing regulations and optimizing the use of Enterococcus in food and medicine.
• Understanding the dual nature of Enterococcus is essential for harnessing probiotic potential while mitigating risks.