Survival of Streptococcus uberis on bedding substrates

Area of Science:

• Veterinary Microbiology
• Bovine Mastitis Pathogenesis
• Environmental Microbiology

Background:

• Streptococcus uberis is a significant environmental mastitis pathogen in cattle.
• Housing design and bedding management are linked to Streptococcus uberis mastitis risk.

Purpose of the Study:

• To evaluate the survival and replication of five Streptococcus uberis strains on three common bedding materials: sand, wheat straw, and kiln-dried pine sawdust.
• To determine the influence of bedding type and potential contamination (faeces, urine) on bacterial persistence.

Main Methods:

• Sterilized bedding substrates were inoculated with five distinct Streptococcus uberis strains.
• Bacterial recovery was assessed over time following incubation at room temperature.
• Comparison of survival rates on clean versus used bedding materials was performed.

Main Results:

• Streptococcus uberis replicated on used bedding materials, indicating faeces and urine promote growth.
• The bacterium persisted for at least 35 days on sand and wheat straw bedding.
• Streptococcus uberis was not recovered beyond 7 days on either clean or used sawdust bedding.

Conclusions:

• Bedding material significantly influences the environmental survival of Streptococcus uberis.
• Sand and straw present a higher risk for Streptococcus uberis persistence compared to sawdust.
• Effective bedding management is crucial for controlling Streptococcus uberis in the farm environment.