Related Experiment Videos
Pathogenicity of two strains of Mycoplasma gallisepticum in turkeys
Abstract:
Strains F and R of Mycoplasma gallisepticum (MG) were compared for their pathogenicity in broad-breasted white turkey poults in terms of induction of airsacculitis, depression of growth rate, and induction of antibody production against MG. Eye-drop inoculation with the F or R strain produced only minimal lesions. However, aerosol exposure with either MG strain resulted in a significantly higher incidence and severity of air-sac lesions (P less than 0.001), reduction of growth rate (P less than 0.005), and hemagglutination-inhibition (HI) antibody titers against MG than did eye-drop inoculation. There were no significant differences between the two MG strains in effects on incidence of air-sac lesions or on growth rate.
Insights
Aerosol exposure to Mycoplasma gallisepticum (MG) strains F and R caused significant airsacculitis and reduced growth in turkey poults. Eye-drop inoculation showed minimal effects, highlighting the importance of exposure route for MG pathogenicity.
Area of Science:
- Veterinary Microbiology
- Avian Pathology
- Poultry Diseases
Background:
- Mycoplasma gallisepticum (MG) is a significant avian pathogen.
- Understanding MG pathogenicity is crucial for poultry health management.
- Different strains and exposure routes can influence disease severity.
Purpose of the Study:
- To compare the pathogenicity of Mycoplasma gallisepticum (MG) strains F and R in turkey poults.
- To evaluate the effects of different inoculation methods on MG-induced disease.
- To assess the impact of MG on growth rate and antibody production.
Main Methods:
- Broad-breasted white turkey poults were inoculated via eye-drop or aerosol with MG strains F or R.
- Pathogenicity was assessed by monitoring airsacculitis, growth rate, and antibody titers (hemagglutination-inhibition).
- Statistical analysis was performed to determine significant differences.
Main Results:
- Aerosol exposure to both MG strains F and R resulted in significantly higher incidence and severity of air-sac lesions compared to eye-drop inoculation (P < 0.001).
- Aerosol exposure also led to significant growth rate reduction (P < 0.005) and increased HI antibody titers against MG.
- No significant differences in air-sac lesions or growth rate were observed between MG strains F and R.
Conclusions:
- Aerosol exposure is a more effective route for inducing Mycoplasma gallisepticum pathogenicity in turkey poults than eye-drop inoculation.
- Both MG strains F and R exhibit similar pathogenicity when administered via aerosol.
- Effective control strategies for Mycoplasma gallisepticum in poultry should consider the route of exposure.