Since the introduction of penicillin in the early twentieth century, antimicrobial treatments have been utilized not only in human medicine but also in veterinary care – initially to ward off diseases, prevent post-surgery infections, and treat sick farm animals.Global food production has intensified over the past 50 years due to economic expansion and popu-lation growth. The use of antimicrobials in agriculture – in livestock, fish farming, and even on crops – has grown as well. Antimicrobials are not only used as medicines, but are sometimes also added in low concentrations to animal feed as a way of stimulating growth.