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Following in Real Time the Impact of Pneumococcal Virulence Factors in an Acute Mouse Pneumonia Model Using Bioluminescent Bacteria

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Vaccination against Staphylococcus aureus pneumonia.

Adam R Spaulding¹, Wilmara Salgado-Pabón¹, Joseph A Merriman¹

¹Department of Microbiology, Carver College of Medicine, University of Iowa, Iowa City.

The Journal of Infectious Diseases

|December 21, 2013

Summary

Vaccinating against Staphylococcus aureus secreted toxins, like superantigens and cytolysins, protects against infection. In contrast, vaccines targeting cell-surface antigens worsened disease severity in rabbits.

Keywords:

Staphylococcus aureus cytolysins endocarditis pneumonia superantigens vaccination

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Area of Science:

Microbiology
Immunology
Vaccinology

Background:

Staphylococcus aureus causes severe hospital and community infections.
Previous vaccine attempts targeting bacterial cell-surface antigens have failed.
This study explores novel vaccine strategies against S. aureus.

Purpose of the Study:

To evaluate the efficacy of vaccination against S. aureus secreted virulence factors.
To compare protection conferred by active vaccination versus passive immunization.
To investigate the role of antibodies in protection against S. aureus.

Main Methods:

Rabbits were actively vaccinated or passively immunized with combinations of superantigens and cytolysins.
Vaccines included wild-type toxins or toxoids, and hyperimmune serum.
Animals were challenged intrapulmonarily with various strains of S. aureus (methicillin-sensitive and -resistant).

Main Results:

Active vaccination against cell-surface antigens worsened disease severity.
Vaccination against superantigens and cytolysins protected 86 of 88 rabbits against S. aureus challenge.
Non-vaccinated controls showed minimal protection (1 of 88).
Passive immunization confirmed the importance of neutralizing antibodies in protection.

Conclusions:

Vaccination against bacterial cell-surface antigens may increase S. aureus disease severity.
Vaccination targeting secreted virulence factors, such as superantigens and cytolysins, provides significant protection.
These findings have crucial implications for developing effective S. aureus vaccines and understanding pathogenesis.