Patent ID: 8236522

Claim:
An extract which preserves and/or retains saccharide components from a mixture of Escherichia coli ( E. coli ) bacterial strains, wherein the individual bacterial strains are grown in a medium which does not pose risk of prion diseases, wherein during the preparation of the extract, the bacterial strains are lysed separately or as a mixture at an initial pH greater than 12, wherein the extract is treated so as to reduce the nucleic acids to less than 100 μg/ml, said extract comprises one or more amino acids wherein 3-80% of said one or more amino acids in the extract is racemized from L to D, and said one or more amino acids is chosen from aspartic acid, asparagine, glutamic acid, glutamine, serine, methionine, histidine, alanine, arginine, phenylalanine, tyrosine, leucine, lysine, valine, and threonine.