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Updated: Jun 8, 2026

Identification of Rare Bacterial Pathogens by 16S rRNA Gene Sequencing and MALDI-TOF MS
Published on: July 11, 2016
Arcobacter defluvii sp. nov., isolated from sewage samples.
Luis Collado1,2, Arturo Levican2, Jessica Perez2
1Institute of Microbiology, Faculty of Sciences, Universidad Austral de Chile, Valdivia, Chile.
Twelve sewage isolates represent a novel bacterial species, Arcobacter defluvii. This discovery expands the understanding of Arcobacter phylogeny and microbial diversity in wastewater environments.
Area of Science:
- Microbiology
- Bacterial Taxonomy
- Environmental Microbiology
Background:
- The genus Arcobacter comprises diverse bacteria found in various environments.
- Accurate classification of novel isolates is crucial for understanding microbial ecology and public health.
Purpose of the Study:
- To taxonomically characterize 12 bacterial isolates from sewage.
- To determine if these isolates represent a new species within the Arcobacter genus.
Main Methods:
- Polyphasic taxonomic approach including 16S rRNA gene sequencing and RFLP analysis.
- Phylogenetic analysis using housekeeping genes (hsp60, rpoB, gyrB).
- Phenotypic characterization of the isolates.
Main Results:
- 16S rRNA gene sequencing and RFLP patterns indicated a novel Arcobacter species.
- Phylogenetic analyses confirmed the isolates formed a distinct lineage.
- Sequence similarity to the closest relative, Arcobacter nitrofigilis, was 95.6%.
Conclusions:
- The 12 sewage isolates represent a novel species, proposed as Arcobacter defluvii sp. nov.
- The gyrB gene is identified as a valuable marker for Arcobacter phylogeny.
- This finding contributes to the knowledge of bacterial diversity in wastewater treatment systems.
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