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Updated: May 11, 2026
The Insect Galleria mellonella as a Powerful Infection Model to Investigate Bacterial Pathogenesis
Published on: December 11, 2012
Galleria mellonella Invertebrate Model Mirrors the Pathogenic Potential of Mycoplasma alligatoris within the Natural
Alexandra M Burne1, Lauren J Richey1,2, Trenton R Schoeb1,3
1Department of Infectious Disease and Immunology, College of Veterinary Medicine, University of Florida, Gainesville, FL 32608, USA.
Abstract:
Most mycoplasmal infections result in chronic, clinically silent disease. In direct contrast, Mycoplasma alligatoris elicits a fulminant, multisystem disease in the natural host, Alligator mississippiensis (American alligator). The goals of the study were to better understand the disease in the natural host and to determine if the invertebrate model G. mellonella could serve as a surrogate alternate host. The survival of alligators infected intratracheally was dose dependent (p=0.0003), ranging from no mortality (102 CFU) to 100% mortality (108 CFU), with 60% mortality at the 104 and 105 CFU infectious dose. Microbial load in blood, joints, and brain was dose dependent, regardless of whether alligators were infected intratracheally or intravenously (p < 0.002). Weight loss was similarly impacted (p < 0.001). Experimental infection of the invertebrate Galleria mellonella mirrored the result in the natural host. In a dose response infection study, both larval survival curves and successful pupation curves were significantly different (p ≤ 0.0001) and dose dependent. Infected insects did not emerge as moths (p < 0.0001). Here, we describe the first study investigating G. mellonella as a surrogate model to assess the pathogenic potential of M. alligatoris. G. mellonella survival was dose dependent and impacted life stage outcome.
Insights
Mycoplasma alligatoris causes severe disease in American alligators. The greater wax moth, Galleria mellonella, effectively models this Mycoplasma alligatoris infection, showing dose-dependent mortality and developmental impacts.
Area of Science:
- Veterinary Pathology
- Infectious Diseases
- Comparative Medicine
Background:
- Most mycoplasmal infections are subclinical, but Mycoplasma alligatoris causes severe, multisystem disease in American alligators.
- Understanding this unique host-pathogen interaction is crucial for alligator health and disease management.
- The need for alternative models to study Mycoplasma alligatoris pathogenesis is recognized.
Purpose of the Study:
- To elucidate the pathogenesis of Mycoplasma alligatoris in its natural host, Alligator mississippiensis.
- To evaluate the suitability of the invertebrate Galleria mellonella as a surrogate model for Mycoplasma alligatoris infection.
Main Methods:
- Alligators were infected intratracheally or intravenously with varying doses of Mycoplasma alligatoris.
- Disease progression, microbial load in tissues, and weight changes were monitored in infected alligators.
- Galleria mellonella larvae were infected with Mycoplasma alligatoris in a dose-response study to assess survival and pupation.
Main Results:
- Alligator survival was dose-dependent, with mortality ranging from 0% to 100% based on infectious dose (10^2 to 10^8 CFU).
- Mycoplasma alligatoris exhibited dose-dependent microbial dissemination to blood, joints, and brain, and caused significant weight loss in alligators.
- Galleria mellonella infection mirrored alligator responses, showing dose-dependent effects on larval survival, pupation, and adult emergence.
Conclusions:
- Mycoplasma alligatoris induces severe, dose-dependent, multisystemic disease in American alligators.
- Galleria mellonella serves as a viable and effective invertebrate surrogate model for studying Mycoplasma alligatoris pathogenicity.
- This study establishes a novel model system for Mycoplasma alligatoris research, facilitating further investigation into its virulence factors.
