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Updated: Mar 22, 2026

Identification of Rare Bacterial Pathogens by 16S rRNA Gene Sequencing and MALDI-TOF MS
Published on: July 11, 2016
High-quality draft genome sequence and description of Haemophilus massiliensis sp. nov
Cheikh Ibrahima Lo1, Senthil Alias Sankar2, Bécaye Fall3
1Aix-Marseille Université, URMITE, UM63, CNRS 7278, IRD 198, Inserm U1095, Faculté de médecine, Marseille, France ; Campus international UCAD-IRD, Dakar, Senegal.
Abstract:
Strain FF7(T) was isolated from the peritoneal fluid of a 44-year-old woman who suffered from pelvic peritonitis. This strain exhibited a 16S rRNA sequence similarity of 94.8 % 16S rRNA sequence identity with Haemophilus parasuis, the phylogenetically closest species with a name with standing in nomenclature and a poor MALDI-TOF MS score (1.32 to 1.56) that does not allow any reliable identification. Using a polyphasic study made of phenotypic and genomic analyses, strain FF7(T) was a Gram-negative, facultatively anaerobic rod and member of the family Pasteurellaceae. It exhibited a genome of 2,442,548 bp long genome (one chromosome but no plasmid) contains 2,319 protein-coding and 67 RNA genes, including 6 rRNA operons. On the basis of these data, we propose the creation of Haemophilus massiliensis sp. nov. with strain FF7(T) (= CSUR P859 = DSM 28247) as the type strain.
Insights
A novel bacterium, Haemophilus massiliensis, was identified from pelvic peritonitis fluid. This Gram-negative bacterium represents a new species within the Pasteurellaceae family, expanding our understanding of microbial diversity.
Area of Science:
- Microbiology
- Bacteriology
- Genomics
Background:
- Pelvic peritonitis can be caused by various bacterial pathogens.
- Accurate identification of causative agents is crucial for effective treatment.
Observation:
- A novel bacterial strain, FF7(T), was isolated from a patient with pelvic peritonitis.
- Strain FF7(T) showed low 16S rRNA sequence identity (94.8%) with Haemophilus parasuis and poor MALDI-TOF MS identification scores.
Findings:
- Polyphasic analysis characterized strain FF7(T) as a Gram-negative, facultatively anaerobic rod.
- Genomic analysis revealed a 2.44 Mbp genome with 2,319 protein-coding genes and 67 RNA genes.
- Based on phenotypic and genomic data, strain FF7(T) is proposed as the type strain of a new species, Haemophilus massiliensis.
Implications:
- The discovery of Haemophilus massiliensis expands the known diversity within the Pasteurellaceae family.
- This finding may contribute to a better understanding of the microbial etiology of peritonitis.
- Further research is needed to determine the clinical significance and pathogenic potential of this new species.
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