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Safety and immune responses to attenuated Salmonella enterica serovar typhi oral live vector vaccines expressing tetanus toxin fragment C.
- Source :
-
Clinical immunology (Orlando, Fla.) [Clin Immunol] 2000 Nov; Vol. 97 (2), pp. 146-53. - Publication Year :
- 2000
-
Abstract
- Attenuated Salmonella enterica serovar Typhi vaccine strain CVD 908-htrA was used as a vector to deliver fragment C of tetanus toxin as a single-dose oral tetanus vaccine candidate to elicit protective levels of serum tetanus antitoxin. Twenty-one healthy adult volunteers received doses of 1.6 x 10(7) to 8.2 x 10(9) CFU of one of two strains, CVD 908-htrA(pTETnir15) or CVD 908-htrA(pTETlpp), which contained plasmid-encoded fragment C, with sodium bicarbonate, and the safety and immune responses to serovar Typhi antigens and tetanus toxin were assessed. No volunteer had fever or positive blood cultures after vaccination, although diarrhea occurred in 3 volunteers and vomiting in 2 volunteers within 3 weeks after vaccination. Most volunteers excreted the vaccine strain in the first 72 h after vaccination. Three of nine volunteers who received 10(8) CFU or higher doses of the CVD 908-htrA(pTETlpp) construct developed rises in serum antitoxin antibodies. The serum and cellular immune responses to serovar Typhi antigens were less frequent than those previously observed in volunteers who ingested the parent strain CVD 908-htrA. This study demonstrates that fragment C of tetanus toxin delivered orally to volunteers in an S. Typhi vector can elicit protective levels of serum antitoxin.<br /> (Copyright 2000 Academic Press.)
- Subjects :
- Adolescent
Adult
Animals
Antibody Formation
Consumer Product Safety
Drug Carriers therapeutic use
Drug Combinations
Drug Evaluation, Preclinical
Humans
Immunity, Cellular
Mice
Mice, Inbred BALB C
Middle Aged
Peptide Fragments therapeutic use
Salmonella Vaccines therapeutic use
Tetanus Toxin therapeutic use
Vaccines, Attenuated therapeutic use
Peptide Fragments administration & dosage
Salmonella Vaccines immunology
Salmonella typhi immunology
Tetanus Toxin administration & dosage
Vaccines, Attenuated immunology
Subjects
Details
- Language :
- English
- ISSN :
- 1521-6616
- Volume :
- 97
- Issue :
- 2
- Database :
- MEDLINE
- Journal :
- Clinical immunology (Orlando, Fla.)
- Publication Type :
- Academic Journal
- Accession number :
- 11027455
- Full Text :
- https://doi.org/10.1006/clim.2000.4924