There are vaccines available for E coli O157 in cattle.

• A. True
• B. False
• C. Not sure
• D. Not applicable

Answer: (A)

Vaccines exist for cattle to reduce colonization and fecal shedding of E. coli O157:H7, which helps lower contamination of the food supply. These vaccines are designed to stimulate mucosal immunity in the bovine gut and can decrease the amount of bacteria shed by infected animals, thereby reducing the risk of transmission to carcasses, hides, and the environment. They are used as part of a broader pre-harvest control program that includes good husbandry, sanitation, and processing controls. It's important to note that vaccination does not completely prevent infection or shedding in all animals, and effectiveness can vary. Nonetheless, the existence and use of these vaccines make the statement true.