Turkeys sinus swabs, sputum swabs from human patients and lung samples from imported beef cattle with respiratory troubles were examined for mvcoplasma. Mycoplasma gallisepticum was identified in 6 out of 36 sinus swabs. Five out of 37 patients were found to be infected with M. pneumoniae. Nine isolates of M. bovirhinis were isolated from the beef cattle. The electrophoretic analysis of M. gallisepticum showed the characteristic 64 KDa protein band. The protein of M. pneumoniae showed high similarity and the 170 Kilodalton (KDa) protein band was detected in the investigated strains. Mycoplasma bovirhinis isolates showed some differences in the molecular weight region of 36 - 40 Kda. Two common bands (40 and 76 KDa) were detected in M. pneumoniae and M. bovirhinis but M. gallisepticum have only one common band (76 KDa).