Pathogenicity of Two Strains of Mycoplasma gallisepticum in Broilers

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Abstract
Strains F and R of M. gallisepticum (MG) were compared in 2 laboratory trials for their relative pathogenicity in terms of inducing airsacculitis and antibody production to MG. Chickens exposed to the R strain had significantly higher incidence of air-sac lesions (P < 0.05) and greater severity of airsacculitis than chicks exposed to the F strain. Chickens vaccinated simultaneously with Newcastle disease-infectious bronchitis vaccine and exposed to MG had more severe lesions than chickens exposed to MG alone. Chickens exposed to the F strain had significantly lower geometric mean hemagglutination-inhibition antibody titers to MG than chicks exposed to the R strain. Chickens vaccinated simultaneously with Newcastle disease-infectious bronchitis vaccine and exposed to R strain had significantly lower body weights than chickens in the other groups.

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