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Experimental infection of ducks with Mycoplasma synoviae
Abstract:
Specific-pathogen-free ducks 24 and 180 days old were inoculated intranasally with the WVU 1853 strain of Mycoplasma synoviae (MS). No significant gross lesions were found in the infraorbital sinus, trachea, or air sacs at 7 or 28 days postinfection (PI), although MS was recovered from all these organs. A few ducks responded serologically by developing agglutinating antibodies. MS multiplied in embryonated duck eggs but to lower titers than in embryonated chicken eggs.
Insights
Specific-pathogen-free ducks inoculated with Mycoplasma synoviae (MS) showed no gross lesions but MS was recovered from organs. Ducks developed antibodies, and MS multiplied in duck eggs, though less than in chicken eggs.
Area of Science:
- Veterinary Microbiology
- Avian Pathology
- Mycoplasma Research
Background:
- Mycoplasma synoviae (MS) is an avian pathogen.
- Understanding MS infection dynamics in ducks is crucial for poultry health.
- Previous research has focused primarily on chickens.
Purpose of the Study:
- To investigate the pathogenicity and host response of Mycoplasma synoviae in ducks.
- To determine the susceptibility of different age groups of ducks to MS infection.
- To evaluate MS replication in duck-specific models.
Main Methods:
- Specific-pathogen-free ducks of two age groups (24 and 180 days old) were intranasally inoculated with the WVU 1853 MS strain.
- Clinical signs and gross lesions were assessed at 7 and 28 days postinfection (PI).
- MS recovery from infraorbital sinus, trachea, and air sacs, serological response, and MS multiplication in embryonated duck and chicken eggs were evaluated.
Main Results:
- No significant gross lesions were observed in inoculated ducks at 7 or 28 days PI.
- Mycoplasma synoviae was consistently recovered from the infraorbital sinus, trachea, and air sacs of infected ducks.
- A limited serological response was detected, with a few ducks developing agglutinating antibodies. MS multiplied in embryonated duck eggs, but at lower titers compared to embryonated chicken eggs.
Conclusions:
- Ducks infected with Mycoplasma synoviae do not exhibit significant gross pathological changes.
- Despite the absence of gross lesions, ducks can harbor and shed MS, indicating subclinical infection.
- The limited antibody production and lower replication titers in duck eggs suggest a different host-pathogen interaction in ducks compared to chickens, warranting further investigation.