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The random amplification of polymorphic DNA (RAPD) was used for epidemiological typing of Chlamydia trachomatis strains. DNA samples from 39 C. trachomatis, 1 C. pneumoniae and 2 C. psittaci strains were screened by the use of 4 single 10-mer primers. Different and reproducible banding profiles were observed on agarose gel electrophoresis. No common profiles were recorded for strains from different Chlamydia species. All C. trachomatis strains of trachoma biovar were distinguished from lymphogranuloma venereum biovar. Moreover, serotypes A to C were separated from serotypes D to K, and some groups of strains sharing the same serotype D to K were further subdivided by RAPD. Conversely, strains of different serotypes could produce identical patterns of amplification, indicating that RAPD did not reflect serotyping. The patterns of amplified products were compared to the restriction fragment length polymorphism of the omp1 gene after amplification and to DNA fingerprinting by use of ribosomal RNA or randomly cloned DNA probes. RAPD seemed to be an alternative molecular typing procedure for epidemiological study and strain identification in urogenital infections due to serotypes D to K.
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