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Active versus Passive Immunity01:31

Active versus Passive Immunity

Immunity, along with the ability to limit pathogen growth to prevent significant body tissue damage, can be gained either by (1) actively developing an immune response within the individual after exposure to a pathogen or after getting vaccinated or (2) passively transferring immune components from an immune individual to one who is nonimmune. Both these forms of immunity can be found naturally and in medical practices.
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Development and Assessment of Intracellular Infection Models for Staphylococcus aureus
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Vaccination and passive immunisation against Staphylococcus aureus.

Adam C Schaffer1, Jean C Lee

  • 1Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA.

International Journal of Antimicrobial Agents
|September 2, 2008
PubMed
Summary

Developing effective Staphylococcus aureus vaccines is challenging due to antibiotic resistance. Previous vaccine candidates targeting surface adhesins and polysaccharides have failed, necessitating novel, multi-component approaches for S. aureus control.

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Area of Science:

  • Microbiology
  • Immunology
  • Vaccine Development

Background:

  • Staphylococcus aureus is a significant pathogen causing infections in both hospital and community settings.
  • Increasing antibiotic resistance in S. aureus necessitates non-antimicrobial control strategies, including immunisation.
  • Previous vaccine candidates have shown limited efficacy in clinical trials.

Purpose of the Study:

  • To review the challenges and progress in developing vaccines against Staphylococcus aureus.
  • To highlight the limitations of existing and failed vaccine candidates.
  • To discuss the potential of novel, multi-component vaccine strategies.

Main Methods:

  • Review of published clinical trial data for S. aureus vaccines.
  • Analysis of pre-clinical research on novel vaccine antigens.
  • Evaluation of S. aureus virulence factors relevant to vaccine design.

Main Results:

  • Capsular polysaccharide-based vaccine (StaphVAX) and human immunoglobulin G (INH-A21) failed in Phase III trials.
  • Novel antigens like cell-wall-anchored adhesins, surface polysaccharides, and exotoxoids are in pre-clinical development.
  • S. aureus possesses multiple, redundant virulence factors complicating vaccine development.

Conclusions:

  • Current S. aureus vaccine strategies have not been successful.
  • A successful S. aureus vaccine will likely require a multi-component approach.
  • Future vaccines may need to incorporate surface proteins, toxoids, and polysaccharides.