Galleria mellonella as a novel invertebrate model for studying Ehrlichia ruminantium pathogenesis and host-pathogen interactions.

Galleria mellonella larvae can host Ehrlichia ruminantium, showing bacterial persistence and moderate mortality over at least two weeks without triggering melanization.

• Why it matters: Studying Ehrlichia ruminantium in arthropod vectors is limited by ethical, logistical, and economic challenges in current models, hindering understanding of host-pathogen interactions.
• What they did: Researchers established Galleria mellonella as an invertebrate infection model by infecting larvae with E. ruminantium, tracking bacterial dissemination with fluorescence microscopy, and measuring bacterial loads via quantitative PCR.
• The result: The model demonstrates bacterial persistence, viability, and infectivity, offering a cost-effective, ethical platform for studying pathogen biology, immune evasion, and screening antimicrobial agents relevant to heartwater disease.