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Infection and Immunity, October 2001, p. 5997-6003, Vol. 69, No. 10
0019-9567/01/$04.00+0   DOI: 10.1128/IAI.69.10.5997-6003.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Protection against Streptococcus pneumoniae Elicited by Immunization with Pneumolysin and CbpA

Abiodun David Ogunniyi,1 Matthew C. Woodrow,1 Jan T. Poolman,2 and James C. Paton1,*

Department of Molecular Biosciences, Adelaide University, Adelaide, South Australia 5005, Australia,1 and GlaxoSmithKline Biologicals, Rue de l'Institut 89, B-1330 Rixensart, Belgium2

Received 9 April 2001/Returned for modification 7 May 2001/Accepted 6 July 2001

The need for the development of cheap and effective vaccines against pneumococcal disease has necessitated the evaluation of common virulence-associated proteins of Streptococcus pneumoniae as potential vaccine antigens. In this study, we examined the capacity of active immunization with a genetic toxoid derivative of pneumolysin (PdB) and/or a fragment of choline binding protein A (CbpA; also known as PspC, Hic, and SpsA) to protect mice from intraperitoneal challenge with medium to very high doses of a highly virulent capsular type 2 pneumococcal strain, D39. The median survival times for mice immunized with the individual protein antigens in different adjuvant combinations were significantly longer than those for mice that received the respective adjuvants alone. Mice immunized with CbpA alone were significantly better protected than mice immunized with PdB alone. Correspondingly, the median survival times for mice that were immunized with a combination of PdB and CbpA were significantly longer than those for mice that received PdB alone but not significantly different from those that received CbpA alone. Mice immunized with the protein antigens in a mixture of monophospholipid A (MPL) and aluminium phosphate (AlPO4) adjuvants had higher antibody titers than mice that received the antigens in AlPO4 alone. Mice immunized with PdB in MPL plus AlPO4 were also significantly better protected than mice that received PdB in AlPO4 alone.

* Corresponding author. Mailing address: Department of Molecular Biosciences, Adelaide University, Adelaide, South Australia 5005, Australia. Phone: 61-8-83035929. Fax: 61-8-83033262. E-mail: james.paton{at}adelaide.edu.au.

Infection and Immunity, October 2001, p. 5997-6003, Vol. 69, No. 10
0019-9567/01/$04.00+0   DOI: 10.1128/IAI.69.10.5997-6003.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


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