The study about Leptospira, particularly pathogenic strain, was conducted in the flood‐prone area in the Special Capital Region of Jakarta. The aim of this study was to discover and identify the serovars of pathogenic Leptospira in the environment, which might infect human during flooding. Seventy‐three samples, consisted of 36 samples of environmental water and 37 samples of soil, were collected from 5 districts of Jakarta. Their pH was measured, and the samples were then cultured in a modified Korthof's medium with 5‐fluorouracil (5‐FU) addition. Polymerase chain reaction, targeted on 23S rDNA (rrl), FlaB and LipL32 genes, was performed to identify Leptospira genus and differentiate the pathogenic. Identification of the pathogenic Leptospira was done utilising DNA sequencing. Seven samples showed amplification of rrl‐gene. flaB and lipl32‐PCR assay indicated one positive amplification band, each. Confirmation of flaB and lipl32 amplicons by DNA sequencing and BLAST analysis showed flaB amplicon (G1B; GenBank accession number ) had 94% similarity with L. licerasiae (), while lipl32 amplicon was not identified as lipl32 of Leptospira. Based on those results, one intermediate pathogenic and six saprophytic Leptospira were obtained from the environment in Jakarta.

Leptospirosis termasuk re-emerging disease dan sering menjadi wabah setelah bencana banjir. Penyakit ini disebabkan oleh bakteri Leptospira patogen yang ditansmisikan secara langsung lewat hewan terinfeksi atau tidak langsung melalui lingkungan yang terkontaminasi urin hewan tersebut. Studi mengenai Leptospira yang ada di lingkungan perairan daerah rawan banjir dilakukan untuk mengetahui penyebaran Leptospira, terutama strain patogen, sehingga dapat dilakukan antisipasi pencegahan. Sampel dikumpulkan dan diukur pHnya dari 20 penampungan air, seperti waduk, danau, sungai, selokan air, di daerah rawan banjir di Jakarta, dan dikultur pada medium Korthof modifikasi mengandung 5-fluorouracil. Pengamatan hasil kultur dilakukan dengan mikroskop lapang gelap selama satu bulan. Diferensiasi Leptospira dilakukan dengan deteksi gen flaB. Hasil menunjukkan bahwa 75% dari sampel yang diperoleh, positif Leptospira. Ph sampel air sebesar 6,6–7,9 masih sesuai untuk pertumbuhan Leptospira. Analisis dengan gen flaB menunjukkan bahwa Leptospira yang diisolasi termasuk jenis saprofit.