Sunarno SUNARNO, Ratih Dian SARASWATI, Yuni RUKMINIATI

ST534: the new sequence type of Corynebacterium diphtheriae causing diphtheria in Jakarta and surrounding areas, Indonesia

Background/aim: The aim of this study was to find out characteristics and patterns of the spread of Corynebacterium diphtheriaeisolated from Jakarta and the surrounding areas, using the whole genome sequencing (WGS) technique and multilocus sequence typing(MLST) approach.Materials and methods: The study samples consisted of 86 C. diphtheriae isolates, which were isolated from diphtheria patients andclose contacts of patients. The DNA sequencing was carried out using the WGS technique. Data conversion applied the U-gene software.Molecular typing was conducted through the MLST approach, then followed by online data analysis.Results: The results showed that as many as 43 (50%) of all samples examined were new types with the same allele profile, namely 9-1-13-4-3-3-4. New sequence type C. diphtheriae is registered in the MLST global database as ST534 based on the allele profile. The tox geneanalysis in 43 isolates with ST534 indicated that there were three mutation positions, all of which were silent mutations.Conclusion: The main cause of diphtheria in Jakarta and the surrounding areas is a new sequence type of C. diphtheriae registered asST534.

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