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Infection and Immunity, July 1999, p. 3680-3685, Vol. 67, No. 7
Swiss Serum and Vaccine Institute Berne,
Bern, Switzerland
Received 3 December 1998/Returned for modification 13 January
1999/Accepted 17 April 1999
The mucosal and systemic immune responses after primary and booster
immunizations with two attenuated live oral vaccine strains derived
from a noninvasive (Vibrio cholerae) and an invasive
(Salmonella typhi) enteric pathogen were comparatively
evaluated. Vaccination with S. typhi Ty21a elicited
antibody-secreting cell (ASC) responses specific for S. typhi O9, 12 lipopolysaccharide (LPS), as well as significant
increases in levels of immunoglobulin G (IgG) and IgA antibodies to the same antigen in serum. A strong systemic CD4+ T-helper type 1 cell-mediated
immune (CMI) response was also induced. In contrast to results with
Ty21a, no evidence of a CMI response was obtained after primary
immunization with V. cholerae CVD 103-HgR in spite of
the good immunogenicity of the vaccine. Volunteers
who received a single dose of CVD 103-HgR primarily developed an IgM
ASC response against whole vaccine cells and purified V. cholerae Inaba LPS, and seroconversion of serum
vibriocidal antibodies occurred in four of five subjects.
Serum IgG anti-cholera toxin antibody titers were of lower
magnitude. For both live vaccines, the volunteers still
presented significant local immunity 14 months after primary
immunization, as revealed by the elevated baseline antibody titers at
the time of the booster immunization and the lower ASC, serum
IgG, and vibriocidal antibody responses after the booster
immunization. These results suggest that local immunity may
interfere with colonization of the gut by both vaccine strains at least
up to 14 months after basis immunization. Interestingly, despite a low
secondary ASC response, Ty21a was able to boost both humoral (anti-LPS
systemic IgG and IgA) and CMI responses. Evidence of a CMI
response was also observed for one of three volunteers
given a cholera vaccine booster dose. The direct comparison of
results with two attenuated live oral vaccine strains in human volunteers clearly showed that the capacity of the vaccine strain to
colonize specific body compartments conditions the pattern of
vaccine-induced immune responses.
0019-9567/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
Mucosal and Systemic Immune Responses in Humans after Primary and
Booster Immunizations with Orally Administered Invasive and
Noninvasive Live Attenuated Bacteria
*
Corresponding author. Mailing address: Department of
Immunology, Swiss Serum and Vaccine Institute Berne, Rehhagstrasse 79, CH-3018 Bern, Switzerland. Phone: 41 31 980 6356. Fax: 41 31 980 6486. E-mail: ssvi.mb.ablang{at}thenet.ch.
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