Genotypic and phenotypic variation among Staphylococcus saprophyticus from human and animal isolates

Area of Science:

• Microbiology
• Genetics
• Veterinary Science

Background:

• Staphylococcus saprophyticus is a significant cause of urinary tract infections in humans.
• Understanding its genotypic and phenotypic diversity is crucial for infection control.
• Investigating isolates from both human and animal origins provides a broader perspective on the pathogen.

Purpose of the Study:

• To compare the genotypic and phenotypic characteristics of Staphylococcus saprophyticus isolates from human and animal sources.
• To identify potential virulence factors and surface properties contributing to S. saprophyticus pathogenicity.
• To explore differences that may explain variations in infection prevalence or severity.

Main Methods:

• Polymerase Chain Reaction (PCR) was used to detect nine potential virulence genes.
• Surface properties including lipase activity, adherence to collagen type I, and hemagglutination were assessed.
• A total of 236 human clinical isolates and 15 animal isolates were analyzed.

Main Results:

• All isolates possessed regulatory genes (agr, sarA, rot) and surface proteins (UafA, Aas).
• Clinical isolates frequently carried the lipase gene (Ssp) and collagen-binding gene (sdrI), unlike animal isolates.
• Lipase activity and collagen adherence were more prevalent in human isolates, while animal isolates showed more hydrophobic properties.

Conclusions:

• Staphylococcus saprophyticus isolates from animals possess traits for urinary tract colonization but may need to acquire genes like sdrI for enhanced virulence.
• Modulating existing properties such as lipase activity and hydrophobicity is also suggested for animal strains.
• Further research is needed to analyze newly acquired genes and modulated properties for a comprehensive understanding of virulence.