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Infection and Immunity, August 2006, p. 4939-4944, Vol. 74, No. 8
0019-9567/06/$08.00+0     doi:10.1128/IAI.00134-06
Copyright © 2006, American Society for Microbiology. All Rights Reserved.

Intranasal Immunization with the Cholera Toxin B Subunit-Pneumococcal Surface Antigen A Fusion Protein Induces Protection against Colonization with Streptococcus pneumoniae and Has Negligible Impact on the Nasopharyngeal and Oral Microbiota of Mice

F. C. Pimenta,1 E. N. Miyaji,2 A. P. M. Arêas,2 M. L. S. Oliveira,2 A. L. S. S. de Andrade,1 P. L. Ho,2 S. K. Hollingshead,3 and L. C. C. Leite2*

Instituto de Patologia Tropical e Saúde Pública, Universidade Federal de Goiás, Goiânia, Brazil,1 Centro de Biotecnologia, Instituto Butantan, São Paulo, Brazil,2 Department of Microbiology, University of Alabama, Birmingham, Alabama3

Received 26 January 2006/ Returned for modification 9 March 2006/ Accepted 23 May 2006

One of the candidate proteins for a mucosal vaccine antigen against Streptococcus pneumoniae is PsaA (pneumococcal surface antigen A). Vaccines targeting mucosal immunity may raise concerns as to possible alterations in the normal microbiota, especially in the case of PsaA, which was shown to have homologs with elevated sequence identity in other viridans group streptococci. In this work, we demonstrate that intranasal immunization with a cholera toxin B subunit-PsaA fusion protein is able to protect mice against colonization with S. pneumoniae but does not significantly alter the natural oral or nasopharyngeal microbiota of mice.

* Corresponding author. Mailing address: Centro de Biotecnologia, Instituto Butantan, Av Vital Brasil 1500, 05503-900, São Paulo, SP, Brazil. Phone and Fax: 55 11 3726-9150. E-mail: lccleite{at}butantan.gov.br.

Editor: J. N. Weiser

Infection and Immunity, August 2006, p. 4939-4944, Vol. 74, No. 8
0019-9567/06/$08.00+0     doi:10.1128/IAI.00134-06
Copyright © 2006, American Society for Microbiology. All Rights Reserved.



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