An object of the invention is to provide a method for the treatment and {TAIL ~ prevention} of bacterial infection caused by Enterobacteriaceae family in central nervous system and peripheral blood circulation in a mammal, which comprises administering to said mammal an effective amount of an outer membrane protein {HEAD ~ A} from Enterobacteriaceae family 
An object of the invention is to provide a method for the treatment and { TAIL ~ prevention } of bacterial infection caused by Enterobacteriaceae family in central nervous system and peripheral blood circulation in a mammal , which comprises administering to said mammal an effective amount of an outer membrane protein { HEAD ~ A } from Enterobacteriaceae family
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