Science doesn’t provide a clear answer to that question, but researchers are working to better understand resistance. Although there is scientific acknowledgement that the use of antibiotics in people is the primary driver of human antibiotic resistance, Phibro Animal Health Corporation recognizes that antibiotics must be used responsibly in food animals to minimize agriculture’s contribution to antibiotic resistance. That’s why the animal health community worked with the Food and Drug Administration (FDA) and the American Veterinary Medical Association (AVMA) to change the way antibiotics are used in livestock and poultry. Changes that took effect in January 2017 in the United States limit the use of antibiotics in animal agriculture and increase oversight by veterinarians.