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2017 ; 5
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From Immunologically Archaic to Neoteric Glycovaccines
#MMPMID28134792
Cavallari M
; De Libero G
Vaccines (Basel)
2017[Jan]; 5
(1
): ä PMID28134792
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Polysaccharides (PS) are present in the outermost surface of bacteria and readily
come in contact with immune cells. They interact with specific antibodies, which
in turn confer protection from infections. Vaccines with PS from pneumococci,
meningococci, Haemophilus influenzae type b, and Salmonella typhi may be
protective, although with the important constraint of failing to generate
permanent immunological memory. This limitation has in part been circumvented by
conjugating glycovaccines to proteins that stimulate T helper cells and
facilitate the establishment of immunological memory. Currently, protection
evoked by conjugated PS vaccines lasts for a few years. The same approach failed
with PS from staphylococci, Streptococcus agalactiae, and Klebsiella. All those
germs cause severe infections in humans and often develop resistance to
antibiotic therapy. Thereby, prevention is of increasing importance to better
control outbreaks. As only 23 of more than 90 pneumococcal serotypes and 4 of 13
clinically relevant Neisseria meningitidis serogroups are covered by available
vaccines there is still tremendous clinical need for PS vaccines. This review
focuses on glycovaccines and the immunological mechanisms for their success or
failure. We discuss recent advances that may facilitate generation of high
affinity anti-PS antibodies and confer specific immunity and long-lasting
protection.