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Infect Immun, August 1998, p. 3744-3751, Vol. 66, No. 8
0019-9567/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.
A Live Recombinant Avirulent Oral Salmonella Vaccine
Expressing Pneumococcal Surface Protein A Induces Protective
Responses against Streptococcus pneumoniae
Amiya R.
Nayak,1
Steven A.
Tinge,1 2
Rebecca C.
Tart,3
Larry S.
McDaniel,3
David E.
Briles,3 and
Roy
Curtiss III1 *
Department of Biology, Washington University,
St. Louis, Missouri 631301;
MEGAN Health
Incorporated, St. Louis, Missouri 631102;
and
Department of Microbiology, University of Alabama at
Birmingham, Birmingham, Alabama 352943
Received 7 January 1998/Returned for modification 9 February
1998/Accepted 31 May 1998
A live oral recombinant Salmonella vaccine strain
expressing pneumococcal surface protein A (PspA) was developed. The
strain was attenuated with
cya
crp mutations. Stable
expression of PspA was achieved by the use of the balanced-lethal
vector-host system, which employs an asd deletion in the
host chromosome to impose an obligate requirement for diaminopimelic
acid. The chromosomal
asd mutation was complemented by a
plasmid vector possessing the asd+ gene. A
portion of the pspA gene from Streptococcus
pneumoniae Rx1 was cloned onto a multicopy Asd+
vector. After oral immunization, the recombinant
Salmonella-PspA vaccine strain colonized the Peyer's
patches, spleens, and livers of BALB/cByJ and CBA/N mice and stimulated
humoral and mucosal antibody responses. Oral immunization of outbred
New Zealand White rabbits with the recombinant Salmonella
strain induced significant anti-PspA immunoglobulin G titers in serum
and vaginal secretions. Polyclonal sera from orally immunized mice
detected PspA on the S. pneumoniae cell surface as revealed
by immunofluorescence. Oral immunization of BALB/cJ mice with the
PspA-producing Salmonella strain elicited antibody to PspA
and resistance to challenge by the mouse-virulent human clinical
isolate S. pneumoniae WU2. Immune sera from orally
immunized mice conferred passive protection against otherwise lethal
intraperitoneal or intravascular challenge with strain WU2.
*
Corresponding author. Mailing address: Department of
Biology, Washington University, Campus Box 1137, One Brookings Dr., St. Louis, MO 63130-4899. Phone: (314) 935-6819. Fax: (314) 935-7246. E-mail: kvatern{at}biodec.wustl.edu.

Present address: Department of Biological Sciences, Campbell
University, Buies Creek, NC 27506.

Present address: Departments of Surgery and Microbiology, School
of Medicine, The University of Mississippi Medical Center,
Jackson, MS
39126.
Infect Immun, August 1998, p. 3744-3751, Vol. 66, No. 8
0019-9567/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.
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