Models matter: the search for an effective Staphylococcus aureus vaccine

Area of Science:

• Microbiology
• Immunology
• Vaccinology

Background:

• Staphylococcus aureus is a prevalent bacterial pathogen, with methicillin-resistant strains posing significant public health risks.
• Numerous Staphylococcus aureus vaccine candidates targeting cell surface virulence factors have failed in clinical trials.
• Current colonization rates indicate S. aureus's success in evading host defenses.

Approach:

• This opinion article critically reviews past Staphylococcus aureus vaccine development strategies.
• It examines the limitations of commonly used preclinical models in predicting human vaccine efficacy.
• The article proposes a shift in focus from solely cell surface antigens to a broader range of virulence factors.

Key Points:

• Over-reliance on rodent models may not accurately reflect human immune responses to Staphylococcus aureus.
• Targeting only cell surface virulence factors has proven insufficient for developing a protective vaccine.
• Alternative strategies are needed to overcome the challenges in Staphylococcus aureus vaccine design.

Conclusions:

• Rethinking preclinical models and antigen selection is crucial for future Staphylococcus aureus vaccine development.
• A comprehensive approach addressing multiple virulence mechanisms may yield a more effective vaccine.
• Improving Staphylococcus aureus vaccine efficacy requires a departure from historical, unsuccessful strategies.