The present invention relates to a synthetic saccharide of general formulathat is related toserotype O3, O3b and/or O5 lipopolysaccharide and conjugate thereof. Said synthetic saccharide, said conjugate and pharmaceutical composition containing said synthetic saccharide or said conjugate are useful for prevention and/or treatment of diseases associated withFurthermore, the synthetic saccharide of general formulais useful as marker in immunological assays for detection of antibodies againstserotype O3, O3b and/or O5 bacteria.
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