<prompt> Tetracyclines are not useful for:TrichomonasChlamydiaSyphilisRickettsia  <response>: achlamydial non specific urethritisblymphogranulima venereumcatupical pneumoniadcholeraebrucellosisfplague. gRelapsing feverh Rickettsial infections: typhus, rocky mountain feverisyphilis ESSENTIALS OF MEDICAL PHARMACOLOGY page no.738 