Antibiotic Stewardship in Food-producing Animals: Challenges, Progress, and Opportunities

Purpose: Approximately two thirds of the tonnage of antibiotics sold in the United States are intended for use in food production, and global use is projected to increase. This review summarizes the rationale for antibiotic use in animal agriculture, therapeutic classes used, risks from antibiotic-resistant organisms, and limits of existing regulation. In addition, opportunities for improved surveillance, stewardship, and advocacy will be highlighted. Methods: A transdisciplinary narrative review of drivers of antibiotics in food production was conducted, including concepts from population health, infectious diseases, veterinary medicine, and consumer advocacy. Findings: Globally, antibiotics of many important classes in human medicine are given to animals for the treatment of a diagnosed illness, disease control and prevention, and growth promotion. Extensive antibiotic use on farms drives the emergence of antibiotic-resistant organisms in food-producing animals, which can be transmitted to people and the environment. Antibiotic stewardship in food production has been associated with decreased rates of resistance in both animals and humans, without reducing farm productivity. Multiple European nations have successfully implemented stewardship strategies, including banning uses for disease prevention, benchmarking antibiotic utilization, and setting national reduction targets. In the United States, medically important antibiotics are no longer permitted for growth promotion; however, antibiotics may be prescribed for other indications with limited veterinary oversight and requirements for reporting. Marked reductions in use have been achieved in the poultry industry, although use in the pork and beef industries remain high. Implications: Despite some progress, significant challenges in surveillance and regulatory oversight remain to prevent the overuse of antibiotics in food production. Consumers remain a potent force via market pressure on grocery stores, restaurants, suppliers, and farmers. Improved, verified labelling is important for informing consumer choices. Numerous public health agencies, consumer groups, and professional societies have called for judicious antibiotic use, but increased direct advocacy from health care professionals is needed.