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IC31, a two-component novel adjuvant mixed with a conjugate vaccine enhances protective immunity against pneumococcal disease in neonatal mice.

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Authors
Olafsdottir, T A
Lingnau, K
Nagy, E
Jonsdottir, I
Issue Date
2009-03-01

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Citation
Scand. J. Immunol. 2009, 69(3):194-202
Abstract
IC31 is a novel adjuvant which combines the immunostimulatory effects of an 11-mer antibacterial peptide (KLKL(5)KLK) and a synthetic oligodeoxynucleotide (ODN1a) which is a Toll-like receptor 9 agonist without containing cytosine phosphate guanine (CpG) motifs. The effects of IC31 on neonatal immune response to vaccination have not been reported. Neonatal mice were immunized once or twice with a Streptococcus pneumoniae serotype 1 polysaccharide conjugate containing Tetanus Toxoid (Pnc1-TT) carrier protein, with or without IC31 or CpG-ODN. IC31 significantly enhanced IgG1, IgG2a and IgG2b antibodies (Ab) to the serotype 1 polysaccharide. One dose of Pnc1-TT and low dose IC31 elicited high Ab levels that protected the neonatal mice completely from bacteraemia and significantly reduced lung infection following i.n. challenge with serotype 1 pneumococcal strain. One-sixth of an adult murine dose of IC31 was sufficient and optimal for induction of protective immunity in neonatal mice. Two doses of Pnc1-TT with or without adjuvants protected the neonatal mice completely, but more rapid Ab response was observed when IC31 was given with the Pnc1-TT. IC31 is a promising new adjuvant for neonatal vaccinations, rapidly enhancing protective humoral responses when combined with Pnc1-TT.
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http://dx.doi.org/10.1111/j.1365-3083.2008.02225.x
ae974a485f413a2113503eed53cd6c53
10.1111/j.1365-3083.2008.02225.x
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