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Experimental infection of ducks with Mycoplasma gallisepticum
Abstract:
Specific-pathogen-free ducks 24 and 180 days old were inoculated intranasally with the S6 strain of Mycoplasma gallisepticum (MG). No significant gross lesions were found in trachea, lung or air sacs at 7 or 28 days postinfection (PI). MG was recovered from the infraorbital sinus and trachea but not from the air sacs 7 and 28 days PI. A few ducks responded serologically by developing agglutinating antibody. MG multiplied in embryonated duck eggs but to lower titers than in embryonated chicken eggs.
Insights
Mycoplasma gallisepticum (MG) infection in ducks showed no major gross lesions but was detected in the sinus and trachea. MG also multiplied in duck eggs, though less effectively than in chicken eggs.
Area of Science:
- Veterinary Microbiology
- Avian Pathology
Background:
- Mycoplasma gallisepticum (MG) is a significant avian pathogen.
- Understanding MG infection dynamics in ducks is crucial for poultry health.
Purpose of the Study:
- To investigate the pathogenicity and shedding of Mycoplasma gallisepticum (S6 strain) in specific-pathogen-free ducks.
- To evaluate the serological response and Mycoplasma gallisepticum replication in duck embryos.
Main Methods:
- Specific-pathogen-free ducks (24 and 180 days old) were intranasally inoculated with Mycoplasma gallisepticum (S6 strain).
- Gross lesions were assessed at 7 and 28 days postinfection (PI).
- Mycoplasma gallisepticum recovery was performed from various tissues, and serological responses were monitored. Embryonated eggs were used to assess Mycoplasma gallisepticum multiplication.
Main Results:
- No significant gross lesions were observed in the trachea, lungs, or air sacs at 7 or 28 days PI.
- Mycoplasma gallisepticum was consistently recovered from the infraorbital sinus and trachea, but not from air sacs.
- A limited serological response (agglutinating antibody) was detected in some ducks. Mycoplasma gallisepticum multiplied in duck eggs, but at lower titers compared to chicken eggs.
Conclusions:
- The S6 strain of Mycoplasma gallisepticum causes subclinical infections in ducks with limited systemic spread.
- Ducks can mount a serological response to Mycoplasma gallisepticum infection.
- Duck embryos support Mycoplasma gallisepticum replication, but less efficiently than chicken embryos, suggesting potential host-specific differences.
