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The 23S ribosomal DNAs were amplified from 11 strains of Leptospira interrogans sensu lato by polymerase chain reaction (PCR) and sequenced. The PCR products of about 290-bp DNA fragments indicated more than 97% sequence similarity to each other. The phylogenetic tree based on the 23S ribosomal DNAs obtained in this study revealed that 11 strains of L. interrogans examined composed a cluster distinct...
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