Helicobacter colisuis sp. nov., isolated from caecal contents of domestic pigs (Sus scrofa domesticus)

Gruntar, Igor (author), Kostanjšek, Rok (author), Pirš, Tina (author), Papić, Bojan (author)

Seven Helicobacter-like isolates were cultured from caecal contents of 100 domestic pigs (Sus scrofa domesticus) sampled as part of the EFSA-coordinated harmonized monitoring of antimicrobial resistance in Campylobacter sp. in 2015. The bacteria were isolated using the standard ISO 10272 procedure for the isolation of thermotolerant Campylobacter with extended incubation time and formed small, grey, moist and flat colonies with a metallic sheen (small Campylobacter-like colonies) on modified Charcoal-Cefoperazone-Deoxycholate Agar (mCCDA) and Skirow agar plates. Morphologically, the bacterial cells were spirilli-shaped and highly motile, 1–2 µm long and ≤0.5 µm wide, Gram-negative, oxidase-positive and catalase-positive. They could not be identified using the standard-prescribed biochemical tests and had uniform, unique and reproducible MALDI-TOF mass spectra that most closely matched those of Helicobacter pullorum. Three strains (11154-15$^T$, 14348–15 and 16470–15) underwent whole-genome sequencing. Analysis of 16S rRNA gene sequences revealed a high similarity (≥99.8 % identity) to Helicobacter canadensis. Pairwise average nucleotide identity (ANI) values revealed that the three studied strains were closely related (ANI ≥98.9 %), but distinct from the previously described Helicobacter species (ANI ≤90.6 %). The core genome-based phylogeny confirmed that the new strains form a distinct clade most closely related to H. canadensis. The conducted polyphasic taxonomic analysis confirmed that the three strains represent a novel Helicobacter species for which the name Helicobacter colisuis sp. nov. is suggested, with strain 11154-15$^T$ (= DSM 113688$^T$ = CCUG 76053$^T$) as the type strain.

• Language: English
• Keywords: Helicobacter, polymerase chain reaction, Sus scrofa, caecum, domestic pig, Sus scrofa domesticus, novel species
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: VF - Veterinary Faculty; BF - Biotechnical Faculty
• Publication status: Published
• Publication version: Version of Record
• Year: 2022
• Number of pages: 7 str.
• Numbering: Vol. 72, iss. 11, art. 005600
• PID: 20.500.12556/RUL-142718
• UDC: 636.09:579
• ISSN on article: 1466-5034
• DOI: 10.1099/ijsem.0.005600
• COBISS.SI-ID: 130261763
• Publication date in RUL: 22.11.2022

Record is a part of a journal

• Title: International journal of systematic and evolutionary microbiology
• Shortened title: Int. j. syst. evol. microbiol.
• Publisher: Society for General Microbiology.
• ISSN: 1466-5034
• COBISS.SI-ID: 521767193

Licences

• License: CC BY 4.0, Creative Commons Attribution 4.0 International
• Link: http://creativecommons.org/licenses/by/4.0/
• Description: This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.

Projects

• Funder: ARRS - Slovenian Research Agency
• Project number: P4-0092
• Name: Zdravje živali, okolje in varna hrana