Name: Escherichia ruysiae van der Putten et al. 2021

Category: Species

Proposed as: sp. nov.

Etymology: ruy’si.ae. N.L. gen. fem. n. ruysiae, named after Anna Charlotte Ruys, Professor of Microbiology at the University of Amsterdam from 1940 to 1969

Pronunciation (Latin), gender: e-s͡he-RI-k^hi-a RUY-si-a͡e, feminine

Type strain: NCCB 100732; NCTC 14359; OPT1704

Conduct genome-based taxonomy at

16S rRNA gene: LR745848 Analyse FASTA

Valid publication: van der Putten BCL, Matamoros S, Mende DR, Scholl ER, Consortium C, Schultsz C. Escherichia ruysiae sp. nov., a novel Gram-stain-negative bacterium, isolated from a faecal sample of an international traveller. Int J Syst Evol Microbiol 2021; 71:4609. 🇳🇱

IJSEM list: Oren A, Garrity GM. Notification list. Notification that new names and new combinations have appeared in volume 71, part 2 of the IJSEM. Int J Syst Evol Microbiol 2021; 71:4766.

Nomenclatural status: validly published under the ICNP

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

Risk group: 2

• Notes:
  • 😷 The risk group for Germany has been imported on 2026-08-13. The full classification is: risk group = 2. — 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 12 times in PubMed until 2026-06-11.
  • 🙆 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 risk group of the species itself.

Parent taxon: Escherichia Castellani and Chalmers 1919 (Approved Lists 1980)

Assigned by: van der Putten BCL, Matamoros S, Mende DR, Scholl ER, Consortium C, Schultsz C. Escherichia ruysiae sp. nov., a novel Gram-stain-negative bacterium, isolated from a faecal sample of an international traveller. Int J Syst Evol Microbiol 2021; 71:4609. 🇳🇱

Linking: To permanently link to this page, use https://doi.org/10.83108/rn.17322Copy to clipboardLink copied to clipboard

Record number: 17322