Abstract
SUMMARY The antigenic relations of 19 serotypes of avian mycoplasma were studied by immunodiffusion and growth inhibition. M. gallisepticum and M. synoviae had no cross reactions with other serotypes. According to the degree of cross reaction by both tests mentioned and the sharing of identical antigenic components by the gel-diffusion test, the 19 serotypes were classified into 9 groups. A modified disc growth inhibition with standardized inocula was adopted. This uses small quantities of antisera and is easy to interpret.
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