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Related Experiment Video

Updated: Aug 19, 2025

A Mouse Model to Assess Innate Immune Response to Staphylococcus aureus Infection
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Practical Mouse Model to Investigate Therapeutics for Staphylococcusaureus Contaminated Surgical Mesh Implants.

Madison M Collins1, Brent Race1, Ronald J Messer1

  • 1Laboratory of Persistent Viral Diseases, Rocky Mountain Laboratories, NIAID, NIH, Hamilton, Montana.

The Journal of Surgical Research
|November 26, 2022
PubMed
Summary

A new mouse model for surgical mesh infections allows rapid testing of treatments. Prophylactic daptomycin effectively cleared methicillin-resistant Staphylococcus aureus, but immunotherapy showed limited success.

Keywords:
CD47DaptomycinMouse modelS aureusSurgical meshTherapeutics

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Area of Science:

  • Biomedical Engineering
  • Infectious Diseases
  • Surgical Innovation

Background:

  • Prosthetic mesh is crucial for hernia repair longevity and complex reconstructions.
  • Mesh infections, though rare, cause significant morbidity and economic burden.
  • A small animal model is needed for preclinical testing of infection treatments.

Purpose of the Study:

  • To develop and validate a novel mouse model for methicillin-resistant Staphylococcus aureus (MRSA)-infected surgical mesh.
  • To assess the efficacy of antibiotic and immunotherapeutic interventions in this model.

Main Methods:

  • Surgical mesh was implanted in mouse hind limbs and inoculated with MRSA.
  • Efficacy of daptomycin (antibiotic) and anti-CD47 (immunotherapy) was tested.
  • Outcomes were measured by animal ambulation and bacterial counts on mesh.

Main Results:

  • Prophylactic daptomycin at surgery cleared MRSA in most mice by day 21.
  • Anti-CD47 immunotherapy was ineffective alone or with daptomycin.
  • Delayed antibiotic therapy (10 days) failed to clear the infection.

Conclusions:

  • This mouse model provides a rapid platform for in vivo testing of antimicrobials and immunomodulators for surgical implant infections.
  • Early prophylactic antibiotic treatment is more effective than delayed therapy or immunotherapy in this model.