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Polysaccharides (PSs) derived from Streptococcus pneumoniae include more than 90 serotypes and differ greatly in their immunogenicity. In addition, immunization with PSs does not induce high affinity antibody production and no memory B-cells are generated. Coupling PSs to carrier proteins has been reported to induce B-cell maturation and to install a B-cell memory. As an alternative carrier protein,...
We describe a new method to obtain conjugates against Neisseria meningitidis serogroups A, B, C, Vibrio cholera, and Salmonella typhi and their immunogenicity in Balb/c mice. The saccharides were activated by basic hydrolysis with the generation of amine groups in the saccharidic chain, and these groups were linked to carboxyl groups of tetanus toxoid by via carbodiimida-mediated reaction. The resultant...
Staphylococcus aureus is a ubiquitous bacterial species that causes serious disease in certain settings. S. aureus disease is difficult to treat, and antibiotic-resistant strains have become common. A vaccine to protect against infection would therefore be beneficial. However, the virulence of S. aureus is determined by a number of different factors, which makes design of a widely effective vaccine...
We investigated whether intranasal immunisation with diphtheria toxoid (DT) conjugated polypeptides encompassing T and B cell epitopes of the SfbI protein (FNBR) or a conformational-constrained B cell epitope of the M1 protein (J8) was able to confer protection against lethal mucosal challenge with a heterologous Streptococcus pyogenes strain. To this end, BALB/c mice were immunised with the conjugates...
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