Abstract: The present invention relates to immunogenic protein-polysaccharide conjugates comprising pneumococcal surface protein (PspA) obtained from Streptococcus pneumoniae conjugated to a capsular polysaccharide from N. meningitidis, and compositions comprising the same. Also provided are methods of manufacture of such immunogenic combinations as well as methods of use of such immunogenic combinations in the prevention and treatment of bacterial meningitis, particularly pneumococcal and meningococcal meningitis.

Abstract: The invention relates to the accurate and precise direct molar-mass measurement of low-molar-mass fragments of polysaccharides such as Haemophilus influenzae Type b. The methods for obtaining such determinations for polysaccharides use size-exclusion chromatography (SEC) with detection by multi-angle laser-light-scattering photometry (MALLS) and differential refractometry (RI) and/or (2) determination of polysaccharide fragments and direct measurement of average chain length by quantitative 1H NMR, from which molar masses may be derived. Variation between the molar masses obtained by the two methods ranged from 5 to 7%.