Serologic Studies with Mycoplasma synoviae in Experimentally Inoculated Chickens

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Abstract
Three strains of M. synoviae (MS) (1853, 9895 and 5044) were used for experimental inoculation of chickens to evaluate the various mycoplasma serologic tests. The MS plate agglutination and hemagglutination-inhibition (HI) tests were highly sensitive for detection of infection; reactions persisted for test periods extending to 63 wk. Correlation between MS HI-tube and micro methods was good. HI titers were highest in sera from birds inoculated with strain 9895. All 3 strains produced cross-reactions with M. gallisepticum (MG) plate antigens, which were detectable for 2-12 wk following MS inoculation; strain 5044 produced the lowest percentage of cross-reactions. MG HI titers of 16 were observed occasionally in sera from all 3 groups of inoculated birds, with the highest percentage occurring in the group inoculated with strain 1853. There may be antigenic differences among the 3 MS strains.

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