Heat shock proteins (HSP) are a conservative group of proteins and are produced by prokaryotic and eukaryotic cells in response to external stimuli . HSP proteins were divided into six groups according to their molecular weight. The chlamydial infections described involved three groups : HSP10 , HSP60 and HSP70 . It has been shown that they are both associated with primary and secondary zakażeniamiChlamydia (C. ) trachomatis and Chlamydophila ( Cp. ) pneumoniae.