Pathogenicity of avian mycoplasma serotypes for embryonated chicken eggs.

Forty-seven strains of avian mycoplasma, representing 8 serotypes (A, B, C, E, L, M, P and R) were tested for pathogenicity to embryonated chicken eggs. Serotypes A and R were distinctly pathogenic, serotype C was slightly pathogenic wheras serotypes B, E, L, M and P were non-pathogenic.