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Cell Immunity in Implant-Associated Infections Caused by Biofilm-Forming Microorganisms.

I V Babushkina1, I A Mamonova2, A S Bondarenko2

  • 1Research Institute of Traumatology, Orthopedics, and Neurosurgery, V. I. Razumovsky Saratov State Medical University, Ministry of Health of the Russian Federation, Saratov, Russia. 10051968@mail.ru.

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Staphylococcus strains from knee replacement infections form biofilms. Patients with these infections show reduced T and B cells and increased NK cells, indicating immune system failure.

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Area of Science:

  • Infectious Diseases
  • Immunology
  • Biomaterials Science

Background:

  • Implant-associated infections are a significant complication following knee replacement surgery.
  • Staphylococcus species are frequently implicated in biofilm formation on biomaterials.
  • Understanding the host immune response is crucial for managing these infections.

Purpose of the Study:

  • To investigate the biofilm-forming capacity of Staphylococcus strains from infected knee replacements.
  • To compare immune cell profiles in patients with implant-associated infections versus controls.
  • To elucidate the role of cell immunity in biofilm-related implant infections.

Main Methods:

  • Experimental demonstration of biofilm formation by isolated Staphylococcus spp.
  • Differential leukocyte counts in patients with infectious complications, non-purulent complications, and healthy volunteers.
  • Analysis of T cell subsets (T-helpers, T-suppressors), B cells, and NK cells.

Main Results:

  • Staphylococcus strains from patients with post-knee replacement infections exhibited high biofilm-forming capacity.
  • Patients with implant-associated infections showed significantly reduced relative numbers of T cells and B cells (p<0.05).
  • A significant increase in Natural Killer (NK) cells was observed in infected patients compared to controls.

Conclusions:

  • High biofilm formation by Staphylococcus spp. contributes to infectious complications after knee replacement.
  • Implant-associated infections are associated with a distinct pattern of cell-mediated immune deficiency.
  • The observed immune cell alterations suggest a failure of cell immunity in combating biofilm infections in knee replacement patients.