Glycoconjugate vaccines are a critical component of the medical arsenal against infectious diseases. This established field continues, however, to experience failures in the clinic. The lack of fundamental understanding of factors controlling clinical efficacy of glycoconjugate vaccines is discussed while key parameters demanding focused and collaborative research are identified.
The pneumococcal enzyme-linked immunosorbent assay (ELISA) measures IgG antibodies in human serum, and it is an important assay that supports licensure of pneumococcal vaccines. The immune correlate of protection, 0.35 µg/ml of IgG antibodies, was determined by the ELISA method. Pfizer has developed a new Luminex-based assay platform to replace the ELISA. These papers describe the important work of (i) validating the Luminex-based assay and (ii) bridging the immune correlate of protection (0.35 µg/ml IgG) to equivalent values reported by the Luminex platform.
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