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Infection and Immunity, April 2006, p. 2145-2153, Vol. 74, No. 4
0019-9567/06/$08.00+0     doi:10.1128/IAI.74.4.2145-2153.2006
Copyright © 2006, American Society for Microbiology. All Rights Reserved.

Immunization with Staphylococcus aureus Clumping Factor B, a Major Determinant in Nasal Carriage, Reduces Nasal Colonization in a Murine Model

Adam C. Schaffer,1,{dagger},{ddagger} Robert M. Solinga,1,{dagger} Jordan Cocchiaro,1,# Marta Portoles,1,§ Kevin B. Kiser,1,¶ Allison Risley,1 Suzanne M. Randall,1 Viviana Valtulina,2 Pietro Speziale,2 Evelyn Walsh,3 Timothy Foster,3 and Jean C. Lee1*

Channing Laboratory, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts,1 Department of Biochemistry, University of Pavia, Viale Taramelli 3/B, 27100 Pavia, Italy,2 Microbiology Department, Moyne Institute of Preventive Medicine, Trinity College, Dublin 2, Ireland3

Received 5 October 2005/ Returned for modification 2 December 2005/ Accepted 5 January 2006

Staphylococcus aureus is responsible for a wide range of infections, including soft tissue infections and potentially fatal bacteremias. The primary niche for S. aureus in humans is the nares, and nasal carriage is a documented risk factor for staphylococcal infection. Previous studies with rodent models of nasal colonization have implicated capsule and teichoic acid as staphylococcal surface factors that promote colonization. In this study, a mouse model of nasal colonization was utilized to demonstrate that S. aureus mutants that lack clumping factor A, collagen binding protein, fibronectin binding proteins A and B, polysaccharide intercellular adhesin, or the accessory gene regulator colonized as well as wild-type strains colonized. In contrast, mutants deficient in sortase A or clumping factor B (ClfB) showed reduced nasal colonization. Mice immunized intranasally with killed S. aureus cells showed reduced nasal colonization compared with control animals. Likewise, mice that were immunized systemically or intranasally with a recombinant vaccine composed of domain A of ClfB exhibited lower levels of colonization than control animals exhibited. A ClfB monoclonal antibody (MAb) inhibited S. aureus binding to mouse cytokeratin 10. Passive immunization of mice with this MAb resulted in reduced nasal colonization compared with the colonization observed after immunization with an isotype-matched control antibody. The mouse immunization studies demonstrate that ClfB is an attractive component for inclusion in a vaccine to reduce S. aureus nasal colonization in humans, which in turn may diminish the risk of staphylococcal infection. As targets for vaccine development and antimicrobial intervention are assessed, rodent nasal colonization models may be invaluable.

* Corresponding author. Mailing address: Channing Laboratory, 181 Longwood Avenue, Boston, MA 02115. Phone: (617) 525-2652. Fax: (617) 731-1541. E-mail: jean.lee{at}channing.harvard.edu.

Editor: J. N. Weiser

{dagger} A.C.S. and R.M.S. contributed equally to this work.

{ddagger} Present address: Division of Nephrology and Hypertension, New York Presbyterian Hospital-Weill Cornell Medical Center, New York, NY 10021.

# Present address: Cell and Molecular Biology, Duke University Medical Center, Durham, NC 27710.

§ Present address: Millipore Corporation, Bedford, MA 01730.

Present address: Cape Fear Community College, Wilmington, NC 28401.

Infection and Immunity, April 2006, p. 2145-2153, Vol. 74, No. 4
0019-9567/06/$08.00+0     doi:10.1128/IAI.74.4.2145-2153.2006
Copyright © 2006, American Society for Microbiology. All Rights Reserved.



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