Name: Cryptobacterium curtum Nakazawa et al. 1999

Category: Species

Proposed as: sp. nov.

Etymology: cur’tum. L. neut. adj. curtum, shortened (a shortened cell of this organism)

Pronunciation, gender: … KUR-tum, neuter

Type strain: 12-3; ATCC 700683; DSM 15641

See detailed strain information at

Conduct genome-based taxonomy at

16S rRNA gene: AB019260 Analyse FASTA

Valid publication: Nakazawa F, Poco SE, Ikeda T, Sato M, Kalfas S, Sundqvist G, Hoshino E. Cryptobacterium curtum gen. nov., sp. nov., a new genus of gram-positive anaerobic rod isolated from human oral cavities. Int J Syst Bacteriol 1999; 49:1193-1200. 🇯🇵

IJSEM list: Anonymous. Notification list. Notification that new names and new combinations have appeared in volume 49, part 3 of the IJSB. Int J Syst Bacteriol 1999; 49:1327-1328.

Nomenclatural status: validly published under the ICNP

Taxonomic status: correct name (and explicitly recommended for medical use)

Risk group: 1

• Notes:
  • 🥇 Nomenclatural type of the genus Cryptobacterium Nakazawa et al. 1999. Publication: Nakazawa F, Poco SE, Ikeda T, Sato M, Kalfas S, Sundqvist G, Hoshino E. Cryptobacterium curtum gen. nov., sp. nov., a new genus of gram-positive anaerobic rod isolated from human oral cavities. Int J Syst Bacteriol 1999; 49:1193-1200. 🇯🇵
  • 😷 The risk group for Canada has been imported on 2024-02-27. The full classification is: risk group = 1, note = "Security sensitive biological agent: No - Terrestrial animal pathogen under Canadian Food Inspection Agency authority: No". — The risk group for Germany has been imported on 2023-10-29. The full classification is: risk group = 1. — If in doubt, use the risk group given in the regulations for your country and, if these are not available, use the risk group given in the catalogue of the culture collection from which you have obtained or intend to obtain the strain.
  • 🎓 Name mentioned 9 times in PubMed until 2025-06-04.
  • 🙆 This name is on the List of Recommended Names for bacteria of medical importance (LoRN) as the name to be applied to this species. The name is on LoRN because of the recorded pathogenicity of the species itself.
  • 🧍 According to Bartlett et al. (2022), this species is a putative human pathogen. Publication: Bartlett A, Padfield D, Lear L, Bendall R, Vos M. A comprehensive list of bacterial pathogens infecting humans. Microbiology (Reading) 2022; 168:0. 🇬🇧
  • 🧍 The genome of the type strain was sequenced as part of the GEBA (Genomic Encyclopedia of Bacteria and Archaea) project. Publication: Mavromatis K, Pukall R, Rohde C, Chen F, Sims D, Brettin T, Kuske C, Detter JC, Han J, Lapidus A, et al. Complete genome sequence of Cryptobacterium curtum type strain (12-3T). Standards in Genomic Sciences 2009; 1:93-100. 🇺🇸
  • 🧍 The type strain is correct in the abstract, but wrong elsewhere (ATCC 700863, sic). Publication: . Erratum. Int. J. Syst. Bacteriol. 1999; 49:1952.

Parent taxon: Cryptobacterium Nakazawa et al. 1999

Assigned by: Nakazawa F, Poco SE, Ikeda T, Sato M, Kalfas S, Sundqvist G, Hoshino E. Cryptobacterium curtum gen. nov., sp. nov., a new genus of gram-positive anaerobic rod isolated from human oral cavities. Int J Syst Bacteriol 1999; 49:1193-1200. 🇯🇵

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Record number: 775287