Leptospira yasudae sp. nov. and Leptospira stimsonii sp. nov., two new species of the pathogenic group isolated from environmental sources

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Abstract
Four spirochetes (F1T, B21, YaleT and AMB6-RJ) were isolated from environmental sources: F1T and B21 from soils of an urban slum community in Salvador (Brazil), YaleT from river water in New Haven, Connecticut (USA) and AMB6-RJ from a pond in a horse farm in Rio de Janeiro (Brazil). Isolates were helix-shaped, aerobic, highly motile and non-virulent in a hamster model of infection. Draft genomes of the strains were obtained and analysed to determine the relatedness to other species of the genus Leptospira . The analysis of 498 core genes showed that strains F1T/B21 and YaleT/AMB6-RJ formed two distinct phylogenetic clades within the ‘Pathogens’ group (group I). The average nucleotide identity (ANI) values of strains F1T/B21 and YaleT/AMB6-RJ to other previously described Leptospira species were below Leptospira yasudae sp. nov. and Leptospira stimsonii sp. nov. as new species in the genus Leptospira . The type strains are F1T (=ATCC-TSD-163=KIT0259=CLEP00287) and YaleT (=ATCC-TDS-162=KIT0258=CLEP00288), respectively.
Funding Information
  • National Institute of Allergy and Infectious Diseases (R01 AI121207)
  • National Institute of Allergy and Infectious Diseases (R01 TW009504)
  • National Institute of Allergy and Infectious Diseases (R25 TW009338)
  • National Institute of Allergy and Infectious Diseases (U01 AI088752)
  • National Institute of Allergy and Infectious Diseases (R01 AI052473)

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