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Urogenital isolates (n = 93) ofChlamydia trachomatis were differentiated into serovars and variants by serotyping with monoclonal antibodies and genotyping by restriction fragment length polymorphism (RFLP) analysis of the PCR-amplifiedomp1 gene, respectively. The types of 87 of the 93 isolates (94%) were identical, as determined by both methods. Among these 87 isolates, 3 isolates were identified as the recently described new serovariant Ga/IOL-238 byomp1 nucleotide sequence analysis of the variable domains. Of the remaining six isolates, three isolates serotyped as both L2 and Ba but were identified as Ba/A-7 by genotyping by RFLP analysis ofomp1 . Theomp1 nucleotide sequences of variable domains VD1, VD2, and VD4 of these urogenital Ba strains were identical to the sequences of the variable domains of Ba/J160, an ocular Ba type. The three remaining isolates were serotyped as J, but the patterns obtained by RFLP analysis ofomp1 , which were identical for the three isolates, differed from that of prototype serovar J/UW36.omp1 nucleotide sequence analysis revealed that these strains are genovariants of serovar J/UW36. Nucleotide sequence differences between serovar J/UW36 and this J genovariant, designated Jv, were found in both variable and constant domains. In conclusion, this study shows that the PCR-based genotyping of clinicalC. trachomatis isolates by RFLP analysis ofomp1 has a higher discriminatory power and is more convenient than serotyping. Variants ofC. trachomatis serovars Ba, G, and J were identified and characterized.

journal of clinical microbiology

Serotyping and Genotyping of Genital <i>Chlamydia trachomatis</i> Isolates Reveal Variants of Serovars Ba, G, and J as Confirmed by <i>omp1</i> Nucleotide Sequence Analysis

Serotyping and Genotyping of Genital Chlamydia trachomatis Isolates Reveal Variants of Serovars Ba, G, and J as Confirmed by omp1 Nucleotide Sequence Analysis