Disclosed is a new and emerging serotype of Streptococcus pneumoniae designated serotype 6D, and assays and monoclonal antibodies useful in identifying same. Also disclosed is a novel pneumococcal polysaccharide with the repeating unit -2) glucose 1 (1-3) glucose 2 (1-3) rhamnose (1-4) ribitol (5-phosphate. This new serotype may be included in pneumococcal vaccines.
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