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Characterization of Streptococcus suis isolates from slaughter swine
Kaicheng Wang1, Wei Zhang, Xiaocheng Li
1China Animal Health and Epidemiology Center, Qingdao, China. kaichengwang@yahoo.cn
Current Microbiology
|December 11, 2012
Summary
Streptococcus suis serotype 7 is the most common in Chinese pigs. This study characterized S. suis strains, identifying virulence factors and genetic backgrounds for better understanding of pig infections.
Area of Science:
- Veterinary Microbiology
- Bacterial Pathogenesis
- Genomics
Background:
- Streptococcus suis is a significant swine pathogen.
- Understanding its epidemiology and virulence is crucial for swine health.
- Chinese swine populations harbor diverse S. suis strains.
Purpose of the Study:
- To characterize Streptococcus suis strains from Chinese slaughter pigs.
- To identify prevalent serotypes, virulence-associated genes, and genetic backgrounds.
- To provide insights into S. suis epidemiology in China.
Main Methods:
- Serum agglutination for serotyping.
- Analysis of virulence-associated genes (mrp, epf, sly).
- Multilocus sequence typing (MLST) for genetic profiling.
Main Results:
- Identified 20 S. suis serotypes, with serotype 7 being most predominant.
- The mrp-/epf-/sly- virulence gene profile was most common.
- First-time identification of epf in serotypes 7 and 9 isolates; MRP and EF expression was not detected in these cases.
- Thirteen new sequence types (STs) were discovered; ST1 and ST27 complexes are prevalent.
- Characterized capsular serotypes, virulence factors, and gene backgrounds of S. suis in Chinese slaughter pigs.
Conclusions:
- S. suis serotype 7 is the dominant serotype in Chinese slaughter pigs.
- Specific virulence gene profiles and MLST complexes are prevalent.
- Further research is needed on the expression of virulence factors like MRP and EF in certain serotypes.
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