Avian E. coli vaccine for the protection against colibacillosis

摘要

Disclosed is the Escherichia coli aroA- microorganism having the identifying characteristics of the strain deposited at the American Type Culture Collection under assigned number PTA-5094. More specifically disclosed is a vaccine composition which comprises an immunogenically effective amount of a mutant E. coli strain having the identifying characteristics of E. coli aroA-PTA-5094 and a pharmacologically acceptable carrier. Also disclosed is a method for the prevention or amelioration of cellulitis in poultry which comprises administering to said poultry an immunogenically effective amount of a strain having the identifying characteristics of E. coli aroA-PTA-5094.