Abstract:
:The immunogenicity of the live oral hybrid vaccine organism Salmonella typhi Ty21a/V. cholerae Inaba (EX210) following its growth in media containing variable concentrations of supplemental galactose was examined in human volunteer subjects. The local intestinal IgA-specific antibody responses to both typhoid and cholera lipopolysaccharide (LPS) preparations were determined. It was observed that the immunogenicity of the galactose-independent Vibrio cholerae O antigen in vivo was dependent upon the variation in galactose-dependent long chain S. typhi O antigen production which was directly proportional to the media galactose concentration. It is likely that this observation was a result of steric hindrance of the presentation of the V. cholerae O antigen by S. typhi Ty21a in the presence of the longer, immunodominant S. typhi Ty21a O antigen. This observation may have relevance to the use of S. typhi vectors in vaccine development involving the presentation of LPS-associated heterologous antigens.
journal_name
Vaccinejournal_title
Vaccineauthors
Forrest BD,LaBrooy JTdoi
10.1016/0264-410x(91)90039-9subject
Has Abstractpub_date
1991-07-01 00:00:00pages
515-20issue
7eissn
0264-410Xissn
1873-2518pii
0264-410X(91)90039-9journal_volume
9pub_type
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