RESUMEN
Chlamidia psitacci, Chlamidia trachomatis, Chlamidia pneumoniae are intracellular bacterial parasites causing ornithosis, trachoma, conjuctivitis, urogenital, respiratory infections, arthritis, Reiter's disease. The role is discussed of the above microorganisms in the development of cardiological, neurological disorders. The past years have seen further progress in microbiological diagnosis but information now available on, in the first place, Chlamidia pneum., is scarce. In most clinical studies they use a serological diagnosis which is not without faults, with the cultural method and polymerization chain reaction being most informative diagnostic tools. The diagnostic value of the above-mentioned reaction will, we believe, increase with its improvement. In the preliminary diagnosis, cytomorphological methods can be made use of.