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J Virol, February 1998, p. 1345-1353, Vol. 72, No. 2
0022-538X/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.
Oral Immunization with Recombinant Norwalk
Virus-Like Particles Induces a Systemic and Mucosal Immune Response
in Mice
Judith M.
Ball,1,
Michele E.
Hardy,1
Robert L.
Atmar,1,2
Margaret E.
Conner,1 and
Mary K.
Estes1,2,*
Division of Molecular
Virology1 and
Department of
Medicine,2 Baylor College of Medicine, Houston,
Texas 77030
Received 9 April 1997/Accepted 19 September 1997
Recombinant Norwalk virus-like particles (rNV VLPs) produced in
insect cells were evaluated as an oral immunogen in CD1 and BALB/c mice
by monitoring rNV-specific serum total and subclass immunoglobulin G
(IgG) and intestinal IgA responses. Dose and kinetics of response were
evaluated in the presence and absence of the mucosal adjuvant cholera
toxin (CT). rNV-specific serum IgG and intestinal IgA were detected in
the absence of CT, and the number of responders was not significantly
different from that of mice administered VLPs with CT at most doses.
The use of CT was associated with induction of higher levels of IgG in serum; this effect was greater at higher doses of VLPs. IgG in serum
was detected in the majority of animals by 9 days postimmunization (dpi), and intestinal IgA responses were detected by 24 dpi. In the
absence of CT, IgG2b was the dominant IgG subclass response in both
mouse strains. Thus, nonreplicating rNV VLPs are immunogenic when
administered orally in the absence of any delivery system or mucosal
adjuvant. These studies demonstrate that rNV VLPs are an excellent
model to study the oral delivery of antigen, and they are a potential
mucosal vaccine for NV infections.
*
Corresponding author. Mailing address: Division of
Molecular Virology and Department of Medicine, Baylor College of
Medicine, One Baylor Plaza, Houston, TX 77030. Phone: (713) 798-3585. Fax: (713) 798-3586. E-mail: mestes{at}bcm.tmc.edu.

Present address: Department of Veterinary Pathobiology, Texas A&M
University, College Station, TX 77843-4467.
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