The origin of Staphylococcus saprophyticus from cattle and pigs

Area of Science:

• Microbiology
• Veterinary Science
• Public Health

Background:

• Staphylococcus saprophyticus is a significant pathogen causing urinary tract infections (UTIs).
• Previous research identified S. saprophyticus as a contaminant in food of animal origin.
• The natural reservoir and transmission routes of S. saprophyticus remain incompletely understood.

Purpose of the Study:

• To investigate the natural reservoir of Staphylococcus saprophyticus.
• To trace the potential zoonotic origin of S. saprophyticus infections.
• To analyze the seasonal distribution of S. saprophyticus in the farming environment.

Main Methods:

• Rectal swabs were collected from cattle and pig carcasses and living cows.
• Environmental samples, including pasture grass and indoor fodder, were collected.
• Bacterial isolation and identification of S. saprophyticus were performed.
• Seasonal variations in bacterial prevalence were analyzed.

Main Results:

• Staphylococcus saprophyticus was detected in 7.1% of cattle carcass swabs and 7.3% of pig carcass swabs.
• The bacterium was isolated from 1.1% of living cow rectal swabs, 1.6% of pasture grass, and 12.4% of indoor fodder.
• Seasonal patterns of S. saprophyticus in isolates paralleled UTI seasonality.
• Fodder showed an earlier peak incidence of S. saprophyticus compared to rectal swabs.

Conclusions:

• The prevalence of S. saprophyticus in farming environments, particularly in fodder, supports a zoonotic origin.
• The findings suggest that the animal agricultural environment is a significant reservoir for S. saprophyticus.
• Understanding these transmission dynamics can inform strategies to prevent S. saprophyticus-related UTIs.