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Journal Article

Immunogenicity and protection in small-animal models with controlled-release tetanus toxoid microparticles as a single-dose vaccine.

M Singh, X M Li, H Wang, J P McGee, T Zamb, W Koff, C Y Wang, D T O'Hagan
M Singh
United Biomedical, Inc., Hauppauge, New York 11788, USA. manmohan_singh@cc.chiron.com
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X M Li
United Biomedical, Inc., Hauppauge, New York 11788, USA. manmohan_singh@cc.chiron.com
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H Wang
United Biomedical, Inc., Hauppauge, New York 11788, USA. manmohan_singh@cc.chiron.com
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J P McGee
United Biomedical, Inc., Hauppauge, New York 11788, USA. manmohan_singh@cc.chiron.com
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T Zamb
United Biomedical, Inc., Hauppauge, New York 11788, USA. manmohan_singh@cc.chiron.com
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W Koff
United Biomedical, Inc., Hauppauge, New York 11788, USA. manmohan_singh@cc.chiron.com
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C Y Wang
United Biomedical, Inc., Hauppauge, New York 11788, USA. manmohan_singh@cc.chiron.com
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D T O'Hagan
United Biomedical, Inc., Hauppauge, New York 11788, USA. manmohan_singh@cc.chiron.com
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ABSTRACT

Tetanus toxoid (TT) was encapsulated in microparticles prepared from polylactide-co-glycolide polymers by a solvent-evaporation technique. Combinations of small- and large-sized microparticles with controlled-release characteristics were used to immunize Sprague-Dawley rats, and the antibody responses were monitored for 1 year. For comparison, control groups of rats were immunized at 0, 1, and 2 months with TT adsorbed to alum. The antibody responses generated by the TT entrapped in microparticles were comparable to those generated by TT adsorbed to alum in control groups from 32 weeks onwards. Microparticles with a single entrapped antigen (TT) induced better antibody responses than microparticles with two antigens (TT and diphtheria toxoid) entrapped simultaneously. A combination vaccine consisting of TT adsorbed to alum and also entrapped in microparticles gave the best antibody responses. In an inhibition assay designed to determine the relative levels of binding of antisera to the antigens, the sera from the microparticle- and the alum-immunized animals showed comparable levels of binding. In addition, in a passive-challenge study with mice, TT adsorbed to alum and TT entrapped in microparticles provided equal levels of protection against a lethal challenge with tetanus toxin. An intradermal-challenge study was also performed with rabbits, which showed similar levels of protection in sera from alum- and microparticle-immunized animals at 4, 12, and 32 weeks after immunization.

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Immunogenicity and protection in small-animal models with controlled-release tetanus toxoid microparticles as a single-dose vaccine.
M Singh, X M Li, H Wang, J P McGee, T Zamb, W Koff, C Y Wang, D T O'Hagan
Infection and Immunity May 1997, 65 (5) 1716-1721; DOI:

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Immunogenicity and protection in small-animal models with controlled-release tetanus toxoid microparticles as a single-dose vaccine.
M Singh, X M Li, H Wang, J P McGee, T Zamb, W Koff, C Y Wang, D T O'Hagan
Infection and Immunity May 1997, 65 (5) 1716-1721; DOI:
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