Substructure within Salmonella enterica subsp. enterica isolates from Australian wildlife

Area of Science:

• Microbiology
• Genomics
• Wildlife Health

Background:

• Salmonella enterica subsp. enterica is a significant bacterial pathogen.
• Understanding the population structure of Salmonella in wildlife is crucial for disease surveillance.
• Australian wildlife represents a potential reservoir for diverse Salmonella strains.

Purpose of the Study:

• To investigate the population genetic structure of Salmonella enterica subsp. enterica in Australian wildlife.
• To identify distinct genetic lineages within these wildlife-associated strains.
• To correlate genetic clades with phenotypic characteristics and host associations.

Main Methods:

• Multilocus sequence typing (MLST) was employed to analyze 56 Salmonella enterica subsp. enterica strains.
• Population assignment algorithms were used to delineate genetic clades.
• Phenotypic characterization and genotypic analysis were performed for clade differentiation.

Main Results:

• The 56 analyzed strains were successfully subdivided into two distinct genetic clades.
• Significant differences were observed between the clades in terms of phenotypic profiles.
• Genotypic variations and host distribution patterns clearly distinguished the two clades.

Conclusions:

• Australian wildlife harbors genetically distinct populations of Salmonella enterica subsp. enterica.
• These findings highlight the importance of wildlife as reservoirs for diverse Salmonella strains.
• The identified clades represent potentially different ecological or pathogenic lineages within this subspecies.