| http://www.w3.org/ns/prov#value | - The vaccine is composed of a substantially pure siderophore receptor protein derived from the outer membrane of a gram-negative bacteria, for example, Salmonella spp., Escherichia spp. and Pasteurella spp. A siderophore receptor protein, useful according to the invention, is a protein or antigenic peptide sequence thereof derived from the outer membrane of a gram negative bacterium, which is capab
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