Experimental foreign body infections in mice challenged with slime-producing Staphylococcus epidermidis
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Abstract:
The virulence of two previously described Staphylococcus epidermidis strains was examined in an experimental model of foreign body infection in mice. Animals challenged with the slime-producing strain developed three times as many infections as animals challenged with the strain that did not produce slime (P less than 0.001). Bacterial isolates recovered from the infected sites retained the characteristics of the inoculated strain. Animals without foreign bodies but challenged in a similar manner with either staphylococcal strain did not become infected. Thus, the presence of a foreign body predisposed the animals to S. epidermidis infection. These results indicate that the production of slime by S. epidermidis is a stable characteristic retained after animal passage and may be important in the pathogenesis of these infections.
Insights
Slime-producing Staphylococcus epidermidis strains cause significantly more foreign body infections in mice. The presence of a foreign body is crucial for infection development, highlighting slime production as a key virulence factor.
Area of Science:
- Microbiology
- Infectious Diseases
- Bacterial Pathogenesis
Background:
- Staphylococcus epidermidis is a common cause of foreign body infections.
- The role of bacterial slime production in S. epidermidis virulence is not fully understood.
Purpose of the Study:
- To investigate the virulence of slime-producing versus non-slime-producing S. epidermidis strains.
- To determine the role of foreign bodies in S. epidermidis infection models.
Main Methods:
- Experimental foreign body infection model in mice using two S. epidermidis strains.
- Comparison of infection rates between slime-producing and non-slime-producing strains.
- Assessment of bacterial isolate characteristics post-infection.
Main Results:
- Animals challenged with the slime-producing strain had three times more infections (P < 0.001).
- Infection occurred only in the presence of a foreign body.
- Bacterial isolates maintained their original characteristics.
Conclusions:
- Slime production is a stable virulence factor for S. epidermidis.
- Foreign bodies are critical for S. epidermidis pathogenesis.
- Slime production likely plays a significant role in S. epidermidis infections.