* Replication Within Macrophages: Francisella specifically targets and multiplies inside macrophages, the very immune cells meant to destroy them. This enables their spread to other parts of the body as infected macrophages circulate.
* Efficient Invasion Mechanism: The bacteria employ a unique system, involving a Type VI secretion system and a Dot/Icm apparatus, to efficiently invade and manipulate host cells.
* Antibiotic Resistance: Some Francisella strains showcase inherent or acquired resistance to certain antibiotics, potentially complicating treatment.
* Ability to Evade the Immune System: Francisella can interfere with various immune functions and pathways, evading detection and destruction by the body's defenses.
* Potential for Bioterrorism: Certain Francisella species carry the designation of potential bioterrorism agents due to their infectiousness, ease of transmission, and pathogenicity.
