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A Murine Model of Group B Streptococcus Vaginal Colonization

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Streptococcus dysgalactiae-Contagious or Environmental?

Nicole Wente¹, Volker Krömker^1,2

¹Department of Bioprocess Engineering and Microbiology, University of Applied Sciences and Arts Hannover, D-30453 Hannover, Germany.

Animals : an Open Access Journal From MDPI

|December 3, 2020

Summary

Genetic diversity of Streptococcus dysgalactiae strains varied across German farms, indicating mixed transmission routes. Some strains persisted for over 14 months, highlighting the need for farm-level strain analysis in bovine mastitis control.

Keywords:

PFGE Streptococcus dysgalactiae contagious environmental

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Area of Science:

Veterinary Microbiology
Bovine Health
Epidemiology

Background:

Streptococcus dysgalactiae is a significant cause of bovine mastitis.
The transmission routes (contagious vs. environmental) of S. dysgalactiae are not fully understood.
Understanding genetic diversity is crucial for elucidating transmission patterns.

Purpose of the Study:

To investigate the genetic diversity of S. dysgalactiae strains in cattle herds.
To determine the transmission routes of S. dysgalactiae at the farm level.
To assess the persistence of S. dysgalactiae strains within farms.

Main Methods:

Collected 93 S. dysgalactiae isolates from clinical mastitis cases across 16 German farms.
Employed pulsed-field gel electrophoresis (PFGE) for strain typing.
Calculated a contagiosity index (CI) based on isolates and strains per farm over 14 months.

Main Results:

Significant variation in S. dysgalactiae strain diversity was observed among farms.
One farm showed high contagiosity (CI=6, single strain), while another had low contagiosity (CI=1.2, multiple strains).
Two S. dysgalactiae strains demonstrated persistence on a farm for at least 14 months.

Conclusions:

S. dysgalactiae infections in cattle can result from various transmission routes.
Farm-level strain typing is essential for identifying transmission pathways.
Certain S. dysgalactiae strains exhibit prolonged survival within the farm environment.