The evolution of Brucella as a model intracellular pathogen.

Brucella species have evolved into versatile models for studying intracellular infection, bacterial cell biology, and host association, with over a century of research revealing key insights.

• Why it matters: Understanding how intracellular bacteria like Brucella evade host defenses and remodel host cell biology is crucial for developing treatments for brucellosis and related zoonoses, yet many mechanisms remain unclear.
• What they did: Researchers have used Brucella as an experimental system through historical and recent studies, including the discovery of non-classical strains from unexpected hosts, to investigate host-pathogen interactions and bacterial evolution.
• The result: This work has advanced knowledge of bacterial adaptation, cell envelope architecture, and host specificity, enabling broader insights into pathogen evolution and host-pathogen dynamics in Alphaproteobacteria.