Culture medium with yeast or soy bean extract as amino acid source and no protein complexes of animal origin

A culture comprising the medium of any one of the previous claims and pathogenic bacteria.

A process for making a medium for cultivating pathogenic bacteria to produce an immunogenic factor comprising adding sufficient non-animal derived proteinaceous material to a standard medium for cultivating bacteria, which does not comprise animal derived proteinaceous material, so that the medium for cultivating pathogenic bacteria comprises at least 20% by dry weight of the non-animal derived proteinaceous material, and does not comprise animal derived proteinaceous material.