Comparative Infection Pathways of Listeria monocytogenes in Humans Versus Ruminants

Area of Science:

• Microbiology
• Infectious Diseases
• Comparative Pathogenesis

Background:

• Listeria monocytogenes (L. monocytogenes) causes severe human infections by crossing the intestinal barrier and spreading to organs like the brain and placenta.
• Intracellular motility allows L. monocytogenes to colonize secondary organs after host cell internalization.
• Ruminant listeriosis is known, but infection dynamics and host-pathogen interactions are poorly understood.

Purpose of the Study:

• To critically compare L. monocytogenes infection pathways in humans and ruminants.
• To highlight molecular mechanisms of bacterial survival, organ tropism, and adaptation to host stressors.
• To clarify how variations in virulence and stress-response factors influence host susceptibility and disease outcomes across species.

Main Methods:

• Comparative analysis of L. monocytogenes infection pathways in humans and ruminants.
• Review of molecular mechanisms enabling bacterial survival, organ tropism, and adaptation.
• Exploration of how lineage, clonal complex, and strain type affect virulence and stress-response determinants.

Main Results:

• Differences in virulence and stress-response factors, influenced by bacterial lineage and strain type, impact host susceptibility.
• Comparative pathogenesis frameworks can be strengthened by understanding these inter-species variations.
• Strain diversity and host association patterns offer insights into L. monocytogenes biology.

Conclusions:

• Addressing knowledge gaps in ruminant listeriosis enhances understanding of L. monocytogenes pathogenesis.
• Integrated understanding of L. monocytogenes biology requires comparative analysis across human and animal hosts.
• Variations in bacterial factors contribute significantly to differential disease outcomes in various hosts.