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Infection and Immunity, October 2004, p. 5807-5813, Vol. 72, No. 10
0019-9567/04/$08.00+0     DOI: 10.1128/IAI.72.10.5807-5813.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.

Limited Role of Antibody in Clearance of Streptococcus pneumoniae in a Murine Model of Colonization

Tera L. McCool{dagger} and Jeffrey N. Weiser*

Departments of Microbiology and Pediatrics, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania

Received 4 May 2004/ Returned for modification 24 June 2004/ Accepted 20 July 2004

Colonization is the first step in the interaction between Streptococcus pneumoniae and its human host. To better understand the mechanisms contributing to natural carriage, a mouse model of pneumococcal colonization was developed with a clinical isolate of S. pneumoniae previously characterized in experimental colonization of humans. Similar to carriage events in humans, colonization of mice was self-limited and there was no evidence of lower respiratory tract or invasive disease. Carriage induced a serum antibody response to whole pneumococci that was associated temporally with clearance of colonization in three inbred strains of mice. Individual mice, however, did not demonstrate a correlation between the density of colonization and amounts of serum or of mucosal antibodies, including antibodies of different isotypes and antigenic specificities. The role of antibody in the clearance of carriage was then examined in mice with genetic defects in humoral immunity. xid mice, which have deficient responses to polysaccharide antigens, cleared colonization at the same rate as the parent strain. Finally, we showed that µMT mice, which lack mature B cells and fail to produce antibody, were unaffected in the density or duration of colonization. These results demonstrate that antibody is not required for clearance of pneumococcal colonization in mice.

* Corresponding author. Mailing address: 402A Johnson Pavilion, Department of Microbiology, University of Pennsylvania, Philadelphia, PA 19104-6076. Phone: (215) 573-3511. Fax: (215) 898-9557. E-mail: weiser{at}mail.med.upenn.edu.

Editor: F. C. Fang

{dagger} Present address: Medical Diagnostic Laboratories, Mt. Laurel, NJ 08054.

Infection and Immunity, October 2004, p. 5807-5813, Vol. 72, No. 10
0019-9567/04/$08.00+0     DOI: 10.1128/IAI.72.10.5807-5813.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.



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