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Disease-associated Streptococcus suis (DASS) in lactation: detection patterns and implications for control.

Robert Mugabi1, Ana Paula S Poeta Silva2, Cara Haden3

  • 1Veterinary Diagnostic and Population Animal Medicine, Iowa State University, Ames, IA, USA. rmugabi@iastate.edu.

Porcine Health Management
|November 7, 2025
PubMed
Summary

Disease-associated Streptococcus suis (DASS) colonization dynamics in pigs are influenced by dam parity and sampling sites. Targeted management and hygiene can reduce DASS transmission, aiding control strategies.

Keywords:
Colonization dynamicsDisease-associated Streptococcus suisMedicated early weaningParity effectStreptococcus suisSwineqPCR

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Area of Science:

  • Veterinary Microbiology
  • Animal Health
  • Swine Disease Epidemiology

Background:

  • Disease-associated Streptococcus suis (DASS) causes significant economic losses and welfare issues in swine.
  • Accurate detection of DASS strains and reservoirs is crucial for effective farm control.
  • Understanding DASS colonization dynamics in dams, piglets, and the environment is essential for developing control strategies.

Purpose of the Study:

  • Investigate DASS colonization dynamics in clinically healthy dams, piglets, and the environment.
  • Identify optimal sampling sites for DASS detection in dams and piglets.
  • Assess the impact of dam parity on DASS colonization and persistence.

Main Methods:

  • Utilized novel qPCR assays targeting the recN gene (species-specific) and SSU_RS01130 gene (disease-associated).
  • Monitored DASS colonization in dams, piglets, and environmental samples on two commercial swine farms.
  • Analyzed colonization patterns in relation to dam parity and sampling site.

Main Results:

  • Gilts and piglets showed higher DASS colonization than sows; tonsil and nasal samples were most reliable for dams.
  • All piglets were colonized within 24 hours of birth, but DASS-negative piglets were observed, indicating potential for control.
  • Farm-specific differences in DASS prevalence and persistence were noted, influenced by management and strain variation.

Conclusions:

  • Parity, sampling site, and environmental reservoirs significantly influence DASS colonization.
  • Findings support improved control strategies like parity segregation, enhanced hygiene, and refined Medicated Early Weaning (MEW).
  • Novel qPCR assays provide a reliable tool for DASS surveillance and evidence-based intervention program development.